Finding the Fourth Proportional to 52,651.12, 72,658.56 and 28,777.90

Step by Step Solution

1. Step 1: Write the proportion equation
   52,651.12 : 72,658.56 = 28,777.90 : x
2. Step 2: Convert to fraction form
   52,651.12/72,658.56 = 28,777.90/x
3. Step 3: Cross multiply
   52,651.12x = 72,658.56 × 28,777.90
4. Step 4: Simplify right side
   52,651.12x = 2,090,960,773.82
5. Step 5: Solve for x
   x = 2,090,960,773.82/52,651.12
6. Step 6: Final answer
   x = 39,713.51