Finding the Fourth Proportional to 612,081.60, 857,799.99 and 612,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   612,081.60 : 857,799.99 = 612,081.60 : x
2. Step 2: Convert to fraction form
   612,081.60/857,799.99 = 612,081.60/x
3. Step 3: Cross multiply
   612,081.60x = 857,799.99 × 612,081.60
4. Step 4: Simplify right side
   612,081.60x = 525,043,590,359.18
5. Step 5: Solve for x
   x = 525,043,590,359.18/612,081.60
6. Step 6: Final answer
   x = 857,799.99