Finding the Fourth Proportional to 2,662.55, 3,987.71 and 1,276.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.55 : 3,987.71 = 1,276.86 : x
2. Step 2: Convert to fraction form
   2,662.55/3,987.71 = 1,276.86/x
3. Step 3: Cross multiply
   2,662.55x = 3,987.71 × 1,276.86
4. Step 4: Simplify right side
   2,662.55x = 5,091,747.39
5. Step 5: Solve for x
   x = 5,091,747.39/2,662.55
6. Step 6: Final answer
   x = 1,912.36