Finding the Fourth Proportional to 11,103.24, 15,314.96 and 7,129.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,103.24 : 15,314.96 = 7,129.18 : x
2. Step 2: Convert to fraction form
   11,103.24/15,314.96 = 7,129.18/x
3. Step 3: Cross multiply
   11,103.24x = 15,314.96 × 7,129.18
4. Step 4: Simplify right side
   11,103.24x = 109,182,994.31
5. Step 5: Solve for x
   x = 109,182,994.31/11,103.24
6. Step 6: Final answer
   x = 9,833.44