Finding the Fourth Proportional to 8,921.17, 12,316.89 and 5,568.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.17 : 12,316.89 = 5,568.91 : x
2. Step 2: Convert to fraction form
   8,921.17/12,316.89 = 5,568.91/x
3. Step 3: Cross multiply
   8,921.17x = 12,316.89 × 5,568.91
4. Step 4: Simplify right side
   8,921.17x = 68,591,651.89
5. Step 5: Solve for x
   x = 68,591,651.89/8,921.17
6. Step 6: Final answer
   x = 7,688.64