Finding the Fourth Proportional to 9,056.64, 12,499.68 and 5,280.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,056.64 : 12,499.68 = 5,280.40 : x
2. Step 2: Convert to fraction form
   9,056.64/12,499.68 = 5,280.40/x
3. Step 3: Cross multiply
   9,056.64x = 12,499.68 × 5,280.40
4. Step 4: Simplify right side
   9,056.64x = 66,003,310.27
5. Step 5: Solve for x
   x = 66,003,310.27/9,056.64
6. Step 6: Final answer
   x = 7,287.84