Finding the Fourth Proportional to 8,429.43, 12,642.58 and 2,807.19

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.43 : 12,642.58 = 2,807.19 : x
2. Step 2: Convert to fraction form
   8,429.43/12,642.58 = 2,807.19/x
3. Step 3: Cross multiply
   8,429.43x = 12,642.58 × 2,807.19
4. Step 4: Simplify right side
   8,429.43x = 35,490,124.15
5. Step 5: Solve for x
   x = 35,490,124.15/8,429.43
6. Step 6: Final answer
   x = 4,210.26