Finding the Fourth Proportional to 8,976.64, 12,387.12 and 5,620.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,976.64 : 12,387.12 = 5,620.96 : x
2. Step 2: Convert to fraction form
   8,976.64/12,387.12 = 5,620.96/x
3. Step 3: Cross multiply
   8,976.64x = 12,387.12 × 5,620.96
4. Step 4: Simplify right side
   8,976.64x = 69,627,506.04
5. Step 5: Solve for x
   x = 69,627,506.04/8,976.64
6. Step 6: Final answer
   x = 7,756.52