Finding the Fourth Proportional to 9,315.24, 12,854.82 and 5,123.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.24 : 12,854.82 = 5,123.40 : x
2. Step 2: Convert to fraction form
   9,315.24/12,854.82 = 5,123.40/x
3. Step 3: Cross multiply
   9,315.24x = 12,854.82 × 5,123.40
4. Step 4: Simplify right side
   9,315.24x = 65,860,384.79
5. Step 5: Solve for x
   x = 65,860,384.79/9,315.24
6. Step 6: Final answer
   x = 7,070.18