Finding the Fourth Proportional to 21,112.55, 31,684.43 and 17,002.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,112.55 : 31,684.43 = 17,002.17 : x
2. Step 2: Convert to fraction form
   21,112.55/31,684.43 = 17,002.17/x
3. Step 3: Cross multiply
   21,112.55x = 31,684.43 × 17,002.17
4. Step 4: Simplify right side
   21,112.55x = 538,704,107.72
5. Step 5: Solve for x
   x = 538,704,107.72/21,112.55
6. Step 6: Final answer
   x = 25,515.83