Finding the Fourth Proportional to 10,428.45, 14,391.31 and 5,712.73

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.45 : 14,391.31 = 5,712.73 : x
2. Step 2: Convert to fraction form
   10,428.45/14,391.31 = 5,712.73/x
3. Step 3: Cross multiply
   10,428.45x = 14,391.31 × 5,712.73
4. Step 4: Simplify right side
   10,428.45x = 82,213,655.81
5. Step 5: Solve for x
   x = 82,213,655.81/10,428.45
6. Step 6: Final answer
   x = 7,883.59