Finding the Fourth Proportional to 8,961.72, 13,451.76 and 5,991.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,961.72 : 13,451.76 = 5,991.18 : x
2. Step 2: Convert to fraction form
   8,961.72/13,451.76 = 5,991.18/x
3. Step 3: Cross multiply
   8,961.72x = 13,451.76 × 5,991.18
4. Step 4: Simplify right side
   8,961.72x = 80,591,915.48
5. Step 5: Solve for x
   x = 80,591,915.48/8,961.72
6. Step 6: Final answer
   x = 8,992.91