Finding the Fourth Proportional to 1,388.73, 1,916.54 and 799.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.73 : 1,916.54 = 799.25 : x
2. Step 2: Convert to fraction form
   1,388.73/1,916.54 = 799.25/x
3. Step 3: Cross multiply
   1,388.73x = 1,916.54 × 799.25
4. Step 4: Simplify right side
   1,388.73x = 1,531,790.60
5. Step 5: Solve for x
   x = 1,531,790.60/1,388.73
6. Step 6: Final answer
   x = 1,103.02