Finding the Fourth Proportional to 1,388.54, 1,916.56 and 799.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.54 : 1,916.56 = 799.17 : x
2. Step 2: Convert to fraction form
   1,388.54/1,916.56 = 799.17/x
3. Step 3: Cross multiply
   1,388.54x = 1,916.56 × 799.17
4. Step 4: Simplify right side
   1,388.54x = 1,531,651.07
5. Step 5: Solve for x
   x = 1,531,651.07/1,388.54
6. Step 6: Final answer
   x = 1,103.06