Finding the Fourth Proportional to 31,276.76, 43,162.40 and 17,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,276.76 : 43,162.40 = 17,128.69 : x
2. Step 2: Convert to fraction form
   31,276.76/43,162.40 = 17,128.69/x
3. Step 3: Cross multiply
   31,276.76x = 43,162.40 × 17,128.69
4. Step 4: Simplify right side
   31,276.76x = 739,315,304.17
5. Step 5: Solve for x
   x = 739,315,304.17/31,276.76
6. Step 6: Final answer
   x = 23,637.85