Finding the Fourth Proportional to 8,618.76, 12,911.22 and 5,688.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,618.76 : 12,911.22 = 5,688.12 : x
2. Step 2: Convert to fraction form
   8,618.76/12,911.22 = 5,688.12/x
3. Step 3: Cross multiply
   8,618.76x = 12,911.22 × 5,688.12
4. Step 4: Simplify right side
   8,618.76x = 73,440,568.71
5. Step 5: Solve for x
   x = 73,440,568.71/8,618.76
6. Step 6: Final answer
   x = 8,521.01