Finding the Fourth Proportional to 8,426.20, 12,620.16 and 5,132.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,426.20 : 12,620.16 = 5,132.04 : x
2. Step 2: Convert to fraction form
   8,426.20/12,620.16 = 5,132.04/x
3. Step 3: Cross multiply
   8,426.20x = 12,620.16 × 5,132.04
4. Step 4: Simplify right side
   8,426.20x = 64,767,165.93
5. Step 5: Solve for x
   x = 64,767,165.93/8,426.20
6. Step 6: Final answer
   x = 7,686.40