Finding the Fourth Proportional to 31,149.77, 42,989.13 and 17,721.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,149.77 : 42,989.13 = 17,721.59 : x
2. Step 2: Convert to fraction form
   31,149.77/42,989.13 = 17,721.59/x
3. Step 3: Cross multiply
   31,149.77x = 42,989.13 × 17,721.59
4. Step 4: Simplify right side
   31,149.77x = 761,835,521.37
5. Step 5: Solve for x
   x = 761,835,521.37/31,149.77
6. Step 6: Final answer
   x = 24,457.18