Finding the Fourth Proportional to 2,566.90, 3,542.33 and 1,387.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,566.90 : 3,542.33 = 1,387.98 : x
2. Step 2: Convert to fraction form
   2,566.90/3,542.33 = 1,387.98/x
3. Step 3: Cross multiply
   2,566.90x = 3,542.33 × 1,387.98
4. Step 4: Simplify right side
   2,566.90x = 4,916,676.25
5. Step 5: Solve for x
   x = 4,916,676.25/2,566.90
6. Step 6: Final answer
   x = 1,915.42