Finding the Fourth Proportional to 9,315.96, 12,856.62 and 5,124.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.96 : 12,856.62 = 5,124.60 : x
2. Step 2: Convert to fraction form
   9,315.96/12,856.62 = 5,124.60/x
3. Step 3: Cross multiply
   9,315.96x = 12,856.62 × 5,124.60
4. Step 4: Simplify right side
   9,315.96x = 65,885,034.85
5. Step 5: Solve for x
   x = 65,885,034.85/9,315.96
6. Step 6: Final answer
   x = 7,072.28