Finding the Fourth Proportional to 9,315.18, 12,854.96 and 5,123.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.18 : 12,854.96 = 5,123.43 : x
2. Step 2: Convert to fraction form
   9,315.18/12,854.96 = 5,123.43/x
3. Step 3: Cross multiply
   9,315.18x = 12,854.96 × 5,123.43
4. Step 4: Simplify right side
   9,315.18x = 65,861,462.10
5. Step 5: Solve for x
   x = 65,861,462.10/9,315.18
6. Step 6: Final answer
   x = 7,070.34