Finding the Fourth Proportional to 8,978.04, 12,397.38 and 8,577.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.04 : 12,397.38 = 8,577.18 : x
2. Step 2: Convert to fraction form
   8,978.04/12,397.38 = 8,577.18/x
3. Step 3: Cross multiply
   8,978.04x = 12,397.38 × 8,577.18
4. Step 4: Simplify right side
   8,978.04x = 106,334,559.79
5. Step 5: Solve for x
   x = 106,334,559.79/8,978.04
6. Step 6: Final answer
   x = 11,843.85