Finding the Fourth Proportional to 31,151.43, 42,987.47 and 17,721.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,151.43 : 42,987.47 = 17,721.42 : x
2. Step 2: Convert to fraction form
   31,151.43/42,987.47 = 17,721.42/x
3. Step 3: Cross multiply
   31,151.43x = 42,987.47 × 17,721.42
4. Step 4: Simplify right side
   31,151.43x = 761,798,707.06
5. Step 5: Solve for x
   x = 761,798,707.06/31,151.43
6. Step 6: Final answer
   x = 24,454.70