Finding the Fourth Proportional to 10,428.71, 14,391.54 and 5,712.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.71 : 14,391.54 = 5,712.89 : x
2. Step 2: Convert to fraction form
   10,428.71/14,391.54 = 5,712.89/x
3. Step 3: Cross multiply
   10,428.71x = 14,391.54 × 5,712.89
4. Step 4: Simplify right side
   10,428.71x = 82,217,212.99
5. Step 5: Solve for x
   x = 82,217,212.99/10,428.71
6. Step 6: Final answer
   x = 7,883.74