Finding the Fourth Proportional to 8,439.33, 12,659.29 and 3,173.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,439.33 : 12,659.29 = 3,173.86 : x
2. Step 2: Convert to fraction form
   8,439.33/12,659.29 = 3,173.86/x
3. Step 3: Cross multiply
   8,439.33x = 12,659.29 × 3,173.86
4. Step 4: Simplify right side
   8,439.33x = 40,178,750.86
5. Step 5: Solve for x
   x = 40,178,750.86/8,439.33
6. Step 6: Final answer
   x = 4,760.90