Finding the Fourth Proportional to 13,142.55, 18,132.06 and 8,429.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.55 : 18,132.06 = 8,429.43 : x
2. Step 2: Convert to fraction form
   13,142.55/18,132.06 = 8,429.43/x
3. Step 3: Cross multiply
   13,142.55x = 18,132.06 × 8,429.43
4. Step 4: Simplify right side
   13,142.55x = 152,842,930.53
5. Step 5: Solve for x
   x = 152,842,930.53/13,142.55
6. Step 6: Final answer
   x = 11,629.63