Finding the Fourth Proportional to 2,662.86, 3,994.90 and 1,275.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.86 : 3,994.90 = 1,275.78 : x
2. Step 2: Convert to fraction form
   2,662.86/3,994.90 = 1,275.78/x
3. Step 3: Cross multiply
   2,662.86x = 3,994.90 × 1,275.78
4. Step 4: Simplify right side
   2,662.86x = 5,096,613.52
5. Step 5: Solve for x
   x = 5,096,613.52/2,662.86
6. Step 6: Final answer
   x = 1,913.96