Finding the Fourth Proportional to 1,727.18, 2,384.42 and 1,387.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,727.18 : 2,384.42 = 1,387.40 : x
2. Step 2: Convert to fraction form
   1,727.18/2,384.42 = 1,387.40/x
3. Step 3: Cross multiply
   1,727.18x = 2,384.42 × 1,387.40
4. Step 4: Simplify right side
   1,727.18x = 3,308,144.31
5. Step 5: Solve for x
   x = 3,308,144.31/1,727.18
6. Step 6: Final answer
   x = 1,915.34