Finding the Fourth Proportional to 2,663.91, 3,996.38 and 1,276.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.91 : 3,996.38 = 1,276.31 : x
2. Step 2: Convert to fraction form
   2,663.91/3,996.38 = 1,276.31/x
3. Step 3: Cross multiply
   2,663.91x = 3,996.38 × 1,276.31
4. Step 4: Simplify right side
   2,663.91x = 5,100,593.39
5. Step 5: Solve for x
   x = 5,100,593.39/2,663.91
6. Step 6: Final answer
   x = 1,914.70