Finding the Fourth Proportional to 123,155.38, 169,956.32 and 72,155.91

Step by Step Solution

1. Step 1: Write the proportion equation
   123,155.38 : 169,956.32 = 72,155.91 : x
2. Step 2: Convert to fraction form
   123,155.38/169,956.32 = 72,155.91/x
3. Step 3: Cross multiply
   123,155.38x = 169,956.32 × 72,155.91
4. Step 4: Simplify right side
   123,155.38x = 12,263,352,929.85
5. Step 5: Solve for x
   x = 12,263,352,929.85/123,155.38
6. Step 6: Final answer
   x = 99,576.27