Answer: $768.98
Step-by-step explanation:
The initial amount Geoffery has = $1750
In Chile, he traded his money for Chilean pesos (CLP) at a rate of
USD:CLP=1:496.5
Now, 
He spent 217,513 pesos before he went to Venezuela.
The money he has before Venezuela =
pesos
In Venezuela, he traded his Chilean pesos for Venezuelan bolivars (VEF) at a rate of CLP:VEF = 1:0.1283
Now, 651362 pesos
During his time in Venezuela, he spent 38,422.19 bolivars.
The money he has before Paraguay =
In Paraguay, he traded his Venezuelan bolivars for Paraguayan guarani (PYG) at a rate of VEF:PYG = 1:1063.9500.

He spent 12,857,441.39 guarani before returning to the United States.
The money he has before returning to the United States=
Now, the rate of PYG:USD = 1:0.00002186.
Then,

Hence, the money Geoffery have remaining in US dollars = $768.98