Finding the Fourth Proportional to 9,120.72, 12,585.54 and 5,141.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.72 : 12,585.54 = 5,141.76 : x
2. Step 2: Convert to fraction form
   9,120.72/12,585.54 = 5,141.76/x
3. Step 3: Cross multiply
   9,120.72x = 12,585.54 × 5,141.76
4. Step 4: Simplify right side
   9,120.72x = 64,711,826.15
5. Step 5: Solve for x
   x = 64,711,826.15/9,120.72
6. Step 6: Final answer
   x = 7,095.03