Finding the Third Proportional to 520,132.25 and 816,139.71

Step by Step Solution

1. Step 1: Write the proportion equation
   520,132.25 : 816,139.71 = 816,139.71 : x
2. Step 2: Convert to fraction form
   520,132.25/816,139.71 = 816,139.71/x
3. Step 3: Cross multiply
   520,132.25x = 816,139.71 × 816,139.71
4. Step 4: Simplify right side
   520,132.25x = 666,084,018,205.07
5. Step 5: Solve for x
   x = 666,084,018,205.07/520,132.25
6. Step 6: Final answer
   x = 1,280,605.12