Finding the Fourth Proportional to 1,388.30, 1,916.26 and 799.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.30 : 1,916.26 = 799.25 : x
2. Step 2: Convert to fraction form
   1,388.30/1,916.26 = 799.25/x
3. Step 3: Cross multiply
   1,388.30x = 1,916.26 × 799.25
4. Step 4: Simplify right side
   1,388.30x = 1,531,559.23
5. Step 5: Solve for x
   x = 1,531,559.23/1,388.30
6. Step 6: Final answer
   x = 1,103.19