Finding the Fourth Proportional to 1,388.26, 1,915.81 and 798.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.26 : 1,915.81 = 798.82 : x
2. Step 2: Convert to fraction form
   1,388.26/1,915.81 = 798.82/x
3. Step 3: Cross multiply
   1,388.26x = 1,915.81 × 798.82
4. Step 4: Simplify right side
   1,388.26x = 1,530,387.34
5. Step 5: Solve for x
   x = 1,530,387.34/1,388.26
6. Step 6: Final answer
   x = 1,102.38