Finding the Fourth Proportional to 8,429.08, 12,629.58 and 5,132.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.08 : 12,629.58 = 5,132.20 : x
2. Step 2: Convert to fraction form
   8,429.08/12,629.58 = 5,132.20/x
3. Step 3: Cross multiply
   8,429.08x = 12,629.58 × 5,132.20
4. Step 4: Simplify right side
   8,429.08x = 64,817,530.48
5. Step 5: Solve for x
   x = 64,817,530.48/8,429.08
6. Step 6: Final answer
   x = 7,689.75