Finding the Fourth Proportional to 8,900.30, 12,272.46 and 7,280.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,900.30 : 12,272.46 = 7,280.15 : x
2. Step 2: Convert to fraction form
   8,900.30/12,272.46 = 7,280.15/x
3. Step 3: Cross multiply
   8,900.30x = 12,272.46 × 7,280.15
4. Step 4: Simplify right side
   8,900.30x = 89,345,349.67
5. Step 5: Solve for x
   x = 89,345,349.67/8,900.30
6. Step 6: Final answer
   x = 10,038.46