Finding the Fourth Proportional to 1,387.31, 1,915.09 and 968.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.31 : 1,915.09 = 968.27 : x
2. Step 2: Convert to fraction form
   1,387.31/1,915.09 = 968.27/x
3. Step 3: Cross multiply
   1,387.31x = 1,915.09 × 968.27
4. Step 4: Simplify right side
   1,387.31x = 1,854,312.20
5. Step 5: Solve for x
   x = 1,854,312.20/1,387.31
6. Step 6: Final answer
   x = 1,336.63