Finding the Fourth Proportional to 2,778.18, 4,166.24 and 928.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.18 : 4,166.24 = 928.91 : x
2. Step 2: Convert to fraction form
   2,778.18/4,166.24 = 928.91/x
3. Step 3: Cross multiply
   2,778.18x = 4,166.24 × 928.91
4. Step 4: Simplify right side
   2,778.18x = 3,870,036.52
5. Step 5: Solve for x
   x = 3,870,036.52/2,778.18
6. Step 6: Final answer
   x = 1,393.01