Finding the Fourth Proportional to 31,868.16, 43,978.56 and 17,721.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,868.16 : 43,978.56 = 17,721.60 : x
2. Step 2: Convert to fraction form
   31,868.16/43,978.56 = 17,721.60/x
3. Step 3: Cross multiply
   31,868.16x = 43,978.56 × 17,721.60
4. Step 4: Simplify right side
   31,868.16x = 779,370,448.90
5. Step 5: Solve for x
   x = 779,370,448.90/31,868.16
6. Step 6: Final answer
   x = 24,456.09