Finding the Fourth Proportional to 31,275.77, 43,160.57 and 17,128.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,275.77 : 43,160.57 = 17,128.61 : x
2. Step 2: Convert to fraction form
   31,275.77/43,160.57 = 17,128.61/x
3. Step 3: Cross multiply
   31,275.77x = 43,160.57 × 17,128.61
4. Step 4: Simplify right side
   31,275.77x = 739,280,397.93
5. Step 5: Solve for x
   x = 739,280,397.93/31,275.77
6. Step 6: Final answer
   x = 23,637.48