Finding the Fourth Proportional to 1,388.30, 1,916.18 and 799.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.30 : 1,916.18 = 799.18 : x
2. Step 2: Convert to fraction form
   1,388.30/1,916.18 = 799.18/x
3. Step 3: Cross multiply
   1,388.30x = 1,916.18 × 799.18
4. Step 4: Simplify right side
   1,388.30x = 1,531,372.73
5. Step 5: Solve for x
   x = 1,531,372.73/1,388.30
6. Step 6: Final answer
   x = 1,103.06