Finding the Fourth Proportional to 72,543.90, 99,945.90 and 56,134.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,543.90 : 99,945.90 = 56,134.69 : x
2. Step 2: Convert to fraction form
   72,543.90/99,945.90 = 56,134.69/x
3. Step 3: Cross multiply
   72,543.90x = 99,945.90 × 56,134.69
4. Step 4: Simplify right side
   72,543.90x = 5,610,432,113.27
5. Step 5: Solve for x
   x = 5,610,432,113.27/72,543.90
6. Step 6: Final answer
   x = 77,338.44