Finding the Fourth Proportional to 10,086.72, 15,121.87 and 7,905.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,086.72 : 15,121.87 = 7,905.18 : x
2. Step 2: Convert to fraction form
   10,086.72/15,121.87 = 7,905.18/x
3. Step 3: Cross multiply
   10,086.72x = 15,121.87 × 7,905.18
4. Step 4: Simplify right side
   10,086.72x = 119,541,104.29
5. Step 5: Solve for x
   x = 119,541,104.29/10,086.72
6. Step 6: Final answer
   x = 11,851.34