Finding the Fourth Proportional to 2,687.67, 4,029.47 and 1,388.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,687.67 : 4,029.47 = 1,388.31 : x
2. Step 2: Convert to fraction form
   2,687.67/4,029.47 = 1,388.31/x
3. Step 3: Cross multiply
   2,687.67x = 4,029.47 × 1,388.31
4. Step 4: Simplify right side
   2,687.67x = 5,594,146.55
5. Step 5: Solve for x
   x = 5,594,146.55/2,687.67
6. Step 6: Final answer
   x = 2,081.41