Finding the Fourth Proportional to 72,153.80, 99,603.86 and 55,158.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,153.80 : 99,603.86 = 55,158.76 : x
2. Step 2: Convert to fraction form
   72,153.80/99,603.86 = 55,158.76/x
3. Step 3: Cross multiply
   72,153.80x = 99,603.86 × 55,158.76
4. Step 4: Simplify right side
   72,153.80x = 5,494,024,635.00
5. Step 5: Solve for x
   x = 5,494,024,635.00/72,153.80
6. Step 6: Final answer
   x = 76,143.25