Finding the Fourth Proportional to 1,388.73, 1,916.33 and 799.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.73 : 1,916.33 = 799.15 : x
2. Step 2: Convert to fraction form
   1,388.73/1,916.33 = 799.15/x
3. Step 3: Cross multiply
   1,388.73x = 1,916.33 × 799.15
4. Step 4: Simplify right side
   1,388.73x = 1,531,435.12
5. Step 5: Solve for x
   x = 1,531,435.12/1,388.73
6. Step 6: Final answer
   x = 1,102.76