Finding the Fourth Proportional to 11,171.50, 15,429.63 and 7,439.02

Step by Step Solution

1. Step 1: Write the proportion equation
   11,171.50 : 15,429.63 = 7,439.02 : x
2. Step 2: Convert to fraction form
   11,171.50/15,429.63 = 7,439.02/x
3. Step 3: Cross multiply
   11,171.50x = 15,429.63 × 7,439.02
4. Step 4: Simplify right side
   11,171.50x = 114,781,326.16
5. Step 5: Solve for x
   x = 114,781,326.16/11,171.50
6. Step 6: Final answer
   x = 10,274.48