Finding the Fourth Proportional to 8,891.90, 12,271.53 and 5,116.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,891.90 : 12,271.53 = 5,116.28 : x
2. Step 2: Convert to fraction form
   8,891.90/12,271.53 = 5,116.28/x
3. Step 3: Cross multiply
   8,891.90x = 12,271.53 × 5,116.28
4. Step 4: Simplify right side
   8,891.90x = 62,784,522.15
5. Step 5: Solve for x
   x = 62,784,522.15/8,891.90
6. Step 6: Final answer
   x = 7,060.87