Finding the Fourth Proportional to 8,876.10, 13,288.55 and 5,420.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,876.10 : 13,288.55 = 5,420.10 : x
2. Step 2: Convert to fraction form
   8,876.10/13,288.55 = 5,420.10/x
3. Step 3: Cross multiply
   8,876.10x = 13,288.55 × 5,420.10
4. Step 4: Simplify right side
   8,876.10x = 72,025,269.86
5. Step 5: Solve for x
   x = 72,025,269.86/8,876.10
6. Step 6: Final answer
   x = 8,114.52