Finding the Fourth Proportional to 8,928.20, 12,320.88 and 5,151.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.20 : 12,320.88 = 5,151.30 : x
2. Step 2: Convert to fraction form
   8,928.20/12,320.88 = 5,151.30/x
3. Step 3: Cross multiply
   8,928.20x = 12,320.88 × 5,151.30
4. Step 4: Simplify right side
   8,928.20x = 63,468,549.14
5. Step 5: Solve for x
   x = 63,468,549.14/8,928.20
6. Step 6: Final answer
   x = 7,108.78