Finding the Fourth Proportional to 1,388.36, 1,915.94 and 798.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.36 : 1,915.94 = 798.86 : x
2. Step 2: Convert to fraction form
   1,388.36/1,915.94 = 798.86/x
3. Step 3: Cross multiply
   1,388.36x = 1,915.94 × 798.86
4. Step 4: Simplify right side
   1,388.36x = 1,530,560.25
5. Step 5: Solve for x
   x = 1,530,560.25/1,388.36
6. Step 6: Final answer
   x = 1,102.43