Finding the Fourth Proportional to 11,115.10, 15,340.89 and 7,141.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,115.10 : 15,340.89 = 7,141.18 : x
2. Step 2: Convert to fraction form
   11,115.10/15,340.89 = 7,141.18/x
3. Step 3: Cross multiply
   11,115.10x = 15,340.89 × 7,141.18
4. Step 4: Simplify right side
   11,115.10x = 109,552,056.85
5. Step 5: Solve for x
   x = 109,552,056.85/11,115.10
6. Step 6: Final answer
   x = 9,856.15