Finding the Fourth Proportional to 8,887.76, 12,267.55 and 5,528.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,887.76 : 12,267.55 = 5,528.57 : x
2. Step 2: Convert to fraction form
   8,887.76/12,267.55 = 5,528.57/x
3. Step 3: Cross multiply
   8,887.76x = 12,267.55 × 5,528.57
4. Step 4: Simplify right side
   8,887.76x = 67,822,023.48
5. Step 5: Solve for x
   x = 67,822,023.48/8,887.76
6. Step 6: Final answer
   x = 7,630.95