Finding the Fourth Proportional to 715,462.86, 987,123.30 and 428,878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   715,462.86 : 987,123.30 = 428,878.38 : x
2. Step 2: Convert to fraction form
   715,462.86/987,123.30 = 428,878.38/x
3. Step 3: Cross multiply
   715,462.86x = 987,123.30 × 428,878.38
4. Step 4: Simplify right side
   715,462.86x = 423,355,841,764.25
5. Step 5: Solve for x
   x = 423,355,841,764.25/715,462.86
6. Step 6: Final answer
   x = 591,723.02