Finding the Fourth Proportional to 13,113.57, 18,096.50 and 7,145.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,113.57 : 18,096.50 = 7,145.29 : x
2. Step 2: Convert to fraction form
   13,113.57/18,096.50 = 7,145.29/x
3. Step 3: Cross multiply
   13,113.57x = 18,096.50 × 7,145.29
4. Step 4: Simplify right side
   13,113.57x = 129,304,686.31
5. Step 5: Solve for x
   x = 129,304,686.31/13,113.57
6. Step 6: Final answer
   x = 9,860.37