Finding the Fourth Proportional to 10,428.32, 14,391.04 and 5,712.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.32 : 14,391.04 = 5,712.56 : x
2. Step 2: Convert to fraction form
   10,428.32/14,391.04 = 5,712.56/x
3. Step 3: Cross multiply
   10,428.32x = 14,391.04 × 5,712.56
4. Step 4: Simplify right side
   10,428.32x = 82,209,679.46
5. Step 5: Solve for x
   x = 82,209,679.46/10,428.32
6. Step 6: Final answer
   x = 7,883.31