Finding the Fourth Proportional to 1,387.75, 1,915.29 and 798.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.75 : 1,915.29 = 798.27 : x
2. Step 2: Convert to fraction form
   1,387.75/1,915.29 = 798.27/x
3. Step 3: Cross multiply
   1,387.75x = 1,915.29 × 798.27
4. Step 4: Simplify right side
   1,387.75x = 1,528,918.55
5. Step 5: Solve for x
   x = 1,528,918.55/1,387.75
6. Step 6: Final answer
   x = 1,101.72