Finding the Fourth Proportional to 10,428.56, 14,391.36 and 5,712.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.56 : 14,391.36 = 5,712.86 : x
2. Step 2: Convert to fraction form
   10,428.56/14,391.36 = 5,712.86/x
3. Step 3: Cross multiply
   10,428.56x = 14,391.36 × 5,712.86
4. Step 4: Simplify right side
   10,428.56x = 82,215,824.89
5. Step 5: Solve for x
   x = 82,215,824.89/10,428.56
6. Step 6: Final answer
   x = 7,883.72