Finding the Fourth Proportional to 2,778.34, 4,167.47 and 830.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.34 : 4,167.47 = 830.56 : x
2. Step 2: Convert to fraction form
   2,778.34/4,167.47 = 830.56/x
3. Step 3: Cross multiply
   2,778.34x = 4,167.47 × 830.56
4. Step 4: Simplify right side
   2,778.34x = 3,461,333.88
5. Step 5: Solve for x
   x = 3,461,333.88/2,778.34
6. Step 6: Final answer
   x = 1,245.83