Finding the Fourth Proportional to 2,381.74, 3,287.14 and 1,387.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,381.74 : 3,287.14 = 1,387.55 : x
2. Step 2: Convert to fraction form
   2,381.74/3,287.14 = 1,387.55/x
3. Step 3: Cross multiply
   2,381.74x = 3,287.14 × 1,387.55
4. Step 4: Simplify right side
   2,381.74x = 4,561,075.86
5. Step 5: Solve for x
   x = 4,561,075.86/2,381.74
6. Step 6: Final answer
   x = 1,915.02