Finding the Fourth Proportional to 1,388.81, 1,916.56 and 799.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.81 : 1,916.56 = 799.54 : x
2. Step 2: Convert to fraction form
   1,388.81/1,916.56 = 799.54/x
3. Step 3: Cross multiply
   1,388.81x = 1,916.56 × 799.54
4. Step 4: Simplify right side
   1,388.81x = 1,532,362.59
5. Step 5: Solve for x
   x = 1,532,362.59/1,388.81
6. Step 6: Final answer
   x = 1,103.36