Finding the Fourth Proportional to 12,693.31, 17,520.10 and 7,389.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,693.31 : 17,520.10 = 7,389.02 : x
2. Step 2: Convert to fraction form
   12,693.31/17,520.10 = 7,389.02/x
3. Step 3: Cross multiply
   12,693.31x = 17,520.10 × 7,389.02
4. Step 4: Simplify right side
   12,693.31x = 129,456,394.63
5. Step 5: Solve for x
   x = 129,456,394.63/12,693.31
6. Step 6: Final answer
   x = 10,198.79