Finding the Fourth Proportional to 9,057.58, 12,499.48 and 5,280.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.58 : 12,499.48 = 5,280.46 : x
2. Step 2: Convert to fraction form
   9,057.58/12,499.48 = 5,280.46/x
3. Step 3: Cross multiply
   9,057.58x = 12,499.48 × 5,280.46
4. Step 4: Simplify right side
   9,057.58x = 66,003,004.16
5. Step 5: Solve for x
   x = 66,003,004.16/9,057.58
6. Step 6: Final answer
   x = 7,287.05