Finding the Fourth Proportional to 11,143.50, 15,385.02 and 7,171.51

Step by Step Solution

1. Step 1: Write the proportion equation
   11,143.50 : 15,385.02 = 7,171.51 : x
2. Step 2: Convert to fraction form
   11,143.50/15,385.02 = 7,171.51/x
3. Step 3: Cross multiply
   11,143.50x = 15,385.02 × 7,171.51
4. Step 4: Simplify right side
   11,143.50x = 110,333,788.92
5. Step 5: Solve for x
   x = 110,333,788.92/11,143.50
6. Step 6: Final answer
   x = 9,901.18