Finding the Fourth Proportional to 10,428.50, 14,391.18 and 5,712.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.50 : 14,391.18 = 5,712.81 : x
2. Step 2: Convert to fraction form
   10,428.50/14,391.18 = 5,712.81/x
3. Step 3: Cross multiply
   10,428.50x = 14,391.18 × 5,712.81
4. Step 4: Simplify right side
   10,428.50x = 82,214,077.02
5. Step 5: Solve for x
   x = 82,214,077.02/10,428.50
6. Step 6: Final answer
   x = 7,883.60