Finding the Fourth Proportional to 13,144.73, 18,139.71 and 8,429

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.73 : 18,139.71 = 8,429 : x
2. Step 2: Convert to fraction form
   13,144.73/18,139.71 = 8,429/x
3. Step 3: Cross multiply
   13,144.73x = 18,139.71 × 8,429
4. Step 4: Simplify right side
   13,144.73x = 152,899,615.59
5. Step 5: Solve for x
   x = 152,899,615.59/13,144.73
6. Step 6: Final answer
   x = 11,632.01