Finding the Third Proportional to 399,735 and 815,526.98

Step by Step Solution

1. Step 1: Write the proportion equation
   399,735 : 815,526.98 = 815,526.98 : x
2. Step 2: Convert to fraction form
   399,735/815,526.98 = 815,526.98/x
3. Step 3: Cross multiply
   399,735x = 815,526.98 × 815,526.98
4. Step 4: Simplify right side
   399,735x = 665,084,262,243.78
5. Step 5: Solve for x
   x = 665,084,262,243.78/399,735
6. Step 6: Final answer
   x = 1,663,812.93