Finding the Fourth Proportional to 2,566.89, 3,542.31 and 1,387.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,566.89 : 3,542.31 = 1,387.96 : x
2. Step 2: Convert to fraction form
   2,566.89/3,542.31 = 1,387.96/x
3. Step 3: Cross multiply
   2,566.89x = 3,542.31 × 1,387.96
4. Step 4: Simplify right side
   2,566.89x = 4,916,584.59
5. Step 5: Solve for x
   x = 4,916,584.59/2,566.89
6. Step 6: Final answer
   x = 1,915.39