Finding the Fourth Proportional to 1,388.14, 1,915.63 and 798.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.14 : 1,915.63 = 798.79 : x
2. Step 2: Convert to fraction form
   1,388.14/1,915.63 = 798.79/x
3. Step 3: Cross multiply
   1,388.14x = 1,915.63 × 798.79
4. Step 4: Simplify right side
   1,388.14x = 1,530,186.09
5. Step 5: Solve for x
   x = 1,530,186.09/1,388.14
6. Step 6: Final answer
   x = 1,102.33