Finding the Fourth Proportional to 715,436.10, 987,086.52 and 428,851.62

Step by Step Solution

1. Step 1: Write the proportion equation
   715,436.10 : 987,086.52 = 428,851.62 : x
2. Step 2: Convert to fraction form
   715,436.10/987,086.52 = 428,851.62/x
3. Step 3: Cross multiply
   715,436.10x = 987,086.52 × 428,851.62
4. Step 4: Simplify right side
   715,436.10x = 423,313,653,182.16
5. Step 5: Solve for x
   x = 423,313,653,182.16/715,436.10
6. Step 6: Final answer
   x = 591,686.18