Finding the Fourth Proportional to 72,154.32, 99,604.57 and 55,159.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,154.32 : 99,604.57 = 55,159.28 : x
2. Step 2: Convert to fraction form
   72,154.32/99,604.57 = 55,159.28/x
3. Step 3: Cross multiply
   72,154.32x = 99,604.57 × 55,159.28
4. Step 4: Simplify right side
   72,154.32x = 5,494,115,867.89
5. Step 5: Solve for x
   x = 5,494,115,867.89/72,154.32
6. Step 6: Final answer
   x = 76,143.97