Finding the Fourth Proportional to 1,388.54, 1,915.98 and 798.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.54 : 1,915.98 = 798.96 : x
2. Step 2: Convert to fraction form
   1,388.54/1,915.98 = 798.96/x
3. Step 3: Cross multiply
   1,388.54x = 1,915.98 × 798.96
4. Step 4: Simplify right side
   1,388.54x = 1,530,791.38
5. Step 5: Solve for x
   x = 1,530,791.38/1,388.54
6. Step 6: Final answer
   x = 1,102.45