Finding the Fourth Proportional to 123,159.32, 169,961.76 and 72,159.85

Step by Step Solution

1. Step 1: Write the proportion equation
   123,159.32 : 169,961.76 = 72,159.85 : x
2. Step 2: Convert to fraction form
   123,159.32/169,961.76 = 72,159.85/x
3. Step 3: Cross multiply
   123,159.32x = 169,961.76 × 72,159.85
4. Step 4: Simplify right side
   123,159.32x = 12,264,414,411.83
5. Step 5: Solve for x
   x = 12,264,414,411.83/123,159.32
6. Step 6: Final answer
   x = 99,581.70