Finding the Fourth Proportional to 8,815.15, 12,164.50 and 5,280.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,815.15 : 12,164.50 = 5,280.31 : x
2. Step 2: Convert to fraction form
   8,815.15/12,164.50 = 5,280.31/x
3. Step 3: Cross multiply
   8,815.15x = 12,164.50 × 5,280.31
4. Step 4: Simplify right side
   8,815.15x = 64,232,331.00
5. Step 5: Solve for x
   x = 64,232,331.00/8,815.15
6. Step 6: Final answer
   x = 7,286.58