Finding the Fourth Proportional to 31,139.21, 42,971.92 and 17,710.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.21 : 42,971.92 = 17,710.43 : x
2. Step 2: Convert to fraction form
   31,139.21/42,971.92 = 17,710.43/x
3. Step 3: Cross multiply
   31,139.21x = 42,971.92 × 17,710.43
4. Step 4: Simplify right side
   31,139.21x = 761,050,921.99
5. Step 5: Solve for x
   x = 761,050,921.99/31,139.21
6. Step 6: Final answer
   x = 24,440.28