Finding the Fourth Proportional to 2,778.32, 4,168.12 and 830.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.32 : 4,168.12 = 830.72 : x
2. Step 2: Convert to fraction form
   2,778.32/4,168.12 = 830.72/x
3. Step 3: Cross multiply
   2,778.32x = 4,168.12 × 830.72
4. Step 4: Simplify right side
   2,778.32x = 3,462,540.65
5. Step 5: Solve for x
   x = 3,462,540.65/2,778.32
6. Step 6: Final answer
   x = 1,246.27