Finding the Fourth Proportional to 72,543.42, 99,945.24 and 56,134.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,543.42 : 99,945.24 = 56,134.20 : x
2. Step 2: Convert to fraction form
   72,543.42/99,945.24 = 56,134.20/x
3. Step 3: Cross multiply
   72,543.42x = 99,945.24 × 56,134.20
4. Step 4: Simplify right side
   72,543.42x = 5,610,346,091.21
5. Step 5: Solve for x
   x = 5,610,346,091.21/72,543.42
6. Step 6: Final answer
   x = 77,337.77