Finding the Fourth Proportional to 13,401.09, 18,491.92 and 7,431.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,401.09 : 18,491.92 = 7,431.30 : x
2. Step 2: Convert to fraction form
   13,401.09/18,491.92 = 7,431.30/x
3. Step 3: Cross multiply
   13,401.09x = 18,491.92 × 7,431.30
4. Step 4: Simplify right side
   13,401.09x = 137,418,986.52
5. Step 5: Solve for x
   x = 137,418,986.52/13,401.09
6. Step 6: Final answer
   x = 10,254.31