Finding the Fourth Proportional to 21,333.51, 31,986.54 and 8,862.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,333.51 : 31,986.54 = 8,862.15 : x
2. Step 2: Convert to fraction form
   21,333.51/31,986.54 = 8,862.15/x
3. Step 3: Cross multiply
   21,333.51x = 31,986.54 × 8,862.15
4. Step 4: Simplify right side
   21,333.51x = 283,469,515.46
5. Step 5: Solve for x
   x = 283,469,515.46/21,333.51
6. Step 6: Final answer
   x = 13,287.52