Finding the Fourth Proportional to 1,388.99, 1,916.79 and 799.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.99 : 1,916.79 = 799.58 : x
2. Step 2: Convert to fraction form
   1,388.99/1,916.79 = 799.58/x
3. Step 3: Cross multiply
   1,388.99x = 1,916.79 × 799.58
4. Step 4: Simplify right side
   1,388.99x = 1,532,626.95
5. Step 5: Solve for x
   x = 1,532,626.95/1,388.99
6. Step 6: Final answer
   x = 1,103.41