Finding the Fourth Proportional to 2,778.86, 4,168.80 and 930.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.86 : 4,168.80 = 930.15 : x
2. Step 2: Convert to fraction form
   2,778.86/4,168.80 = 930.15/x
3. Step 3: Cross multiply
   2,778.86x = 4,168.80 × 930.15
4. Step 4: Simplify right side
   2,778.86x = 3,877,609.32
5. Step 5: Solve for x
   x = 3,877,609.32/2,778.86
6. Step 6: Final answer
   x = 1,395.39