Finding the Fourth Proportional to 10,111.28, 15,134.51 and 5,419.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.28 : 15,134.51 = 5,419.76 : x
2. Step 2: Convert to fraction form
   10,111.28/15,134.51 = 5,419.76/x
3. Step 3: Cross multiply
   10,111.28x = 15,134.51 × 5,419.76
4. Step 4: Simplify right side
   10,111.28x = 82,025,349.79
5. Step 5: Solve for x
   x = 82,025,349.79/10,111.28
6. Step 6: Final answer
   x = 8,112.27