Finding the Fourth Proportional to 9,315.96, 12,856.02 and 5,124.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.96 : 12,856.02 = 5,124.18 : x
2. Step 2: Convert to fraction form
   9,315.96/12,856.02 = 5,124.18/x
3. Step 3: Cross multiply
   9,315.96x = 12,856.02 × 5,124.18
4. Step 4: Simplify right side
   9,315.96x = 65,876,560.56
5. Step 5: Solve for x
   x = 65,876,560.56/9,315.96
6. Step 6: Final answer
   x = 7,071.37