Finding the Fourth Proportional to 9,316.48, 12,856.80 and 5,124.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,316.48 : 12,856.80 = 5,124.72 : x
2. Step 2: Convert to fraction form
   9,316.48/12,856.80 = 5,124.72/x
3. Step 3: Cross multiply
   9,316.48x = 12,856.80 × 5,124.72
4. Step 4: Simplify right side
   9,316.48x = 65,887,500.10
5. Step 5: Solve for x
   x = 65,887,500.10/9,316.48
6. Step 6: Final answer
   x = 7,072.15