Finding the Fourth Proportional to 10,428.48, 14,391.12 and 5,712.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.48 : 14,391.12 = 5,712.72 : x
2. Step 2: Convert to fraction form
   10,428.48/14,391.12 = 5,712.72/x
3. Step 3: Cross multiply
   10,428.48x = 14,391.12 × 5,712.72
4. Step 4: Simplify right side
   10,428.48x = 82,212,439.05
5. Step 5: Solve for x
   x = 82,212,439.05/10,428.48
6. Step 6: Final answer
   x = 7,883.45