Finding the Fourth Proportional to 8,987.10, 12,398.79 and 5,449.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,987.10 : 12,398.79 = 5,449.02 : x
2. Step 2: Convert to fraction form
   8,987.10/12,398.79 = 5,449.02/x
3. Step 3: Cross multiply
   8,987.10x = 12,398.79 × 5,449.02
4. Step 4: Simplify right side
   8,987.10x = 67,561,254.69
5. Step 5: Solve for x
   x = 67,561,254.69/8,987.10
6. Step 6: Final answer
   x = 7,517.58