Finding the Fourth Proportional to 123,726.79, 170,733.58 and 72,741.61

Step by Step Solution

1. Step 1: Write the proportion equation
   123,726.79 : 170,733.58 = 72,741.61 : x
2. Step 2: Convert to fraction form
   123,726.79/170,733.58 = 72,741.61/x
3. Step 3: Cross multiply
   123,726.79x = 170,733.58 × 72,741.61
4. Step 4: Simplify right side
   123,726.79x = 12,419,435,490.26
5. Step 5: Solve for x
   x = 12,419,435,490.26/123,726.79
6. Step 6: Final answer
   x = 100,377.90