Finding the Fourth Proportional to 2,381.91, 3,287.24 and 1,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,381.91 : 3,287.24 = 1,387.50 : x
2. Step 2: Convert to fraction form
   2,381.91/3,287.24 = 1,387.50/x
3. Step 3: Cross multiply
   2,381.91x = 3,287.24 × 1,387.50
4. Step 4: Simplify right side
   2,381.91x = 4,561,045.50
5. Step 5: Solve for x
   x = 4,561,045.50/2,381.91
6. Step 6: Final answer
   x = 1,914.87