Finding the Fourth Proportional to 8,878.56, 12,258.60 and 5,522.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,878.56 : 12,258.60 = 5,522.88 : x
2. Step 2: Convert to fraction form
   8,878.56/12,258.60 = 5,522.88/x
3. Step 3: Cross multiply
   8,878.56x = 12,258.60 × 5,522.88
4. Step 4: Simplify right side
   8,878.56x = 67,702,776.77
5. Step 5: Solve for x
   x = 67,702,776.77/8,878.56
6. Step 6: Final answer
   x = 7,625.43