Finding the Fourth Proportional to 1,388.31, 1,915.95 and 799.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.31 : 1,915.95 = 799.04 : x
2. Step 2: Convert to fraction form
   1,388.31/1,915.95 = 799.04/x
3. Step 3: Cross multiply
   1,388.31x = 1,915.95 × 799.04
4. Step 4: Simplify right side
   1,388.31x = 1,530,911.11
5. Step 5: Solve for x
   x = 1,530,911.11/1,388.31
6. Step 6: Final answer
   x = 1,102.72