Finding the Fourth Proportional to 1,388.80, 1,916.50 and 799.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.80 : 1,916.50 = 799.46 : x
2. Step 2: Convert to fraction form
   1,388.80/1,916.50 = 799.46/x
3. Step 3: Cross multiply
   1,388.80x = 1,916.50 × 799.46
4. Step 4: Simplify right side
   1,388.80x = 1,532,165.09
5. Step 5: Solve for x
   x = 1,532,165.09/1,388.80
6. Step 6: Final answer
   x = 1,103.23