Finding the Fourth Proportional to 31,139.13, 42,973.29 and 17,712.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.13 : 42,973.29 = 17,712.75 : x
2. Step 2: Convert to fraction form
   31,139.13/42,973.29 = 17,712.75/x
3. Step 3: Cross multiply
   31,139.13x = 42,973.29 × 17,712.75
4. Step 4: Simplify right side
   31,139.13x = 761,175,142.45
5. Step 5: Solve for x
   x = 761,175,142.45/31,139.13
6. Step 6: Final answer
   x = 24,444.33