Finding the Fourth Proportional to 2,778.38, 4,167.56 and 830.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.38 : 4,167.56 = 830.51 : x
2. Step 2: Convert to fraction form
   2,778.38/4,167.56 = 830.51/x
3. Step 3: Cross multiply
   2,778.38x = 4,167.56 × 830.51
4. Step 4: Simplify right side
   2,778.38x = 3,461,196.10
5. Step 5: Solve for x
   x = 3,461,196.10/2,778.38
6. Step 6: Final answer
   x = 1,245.76