Finding the Fourth Proportional to 1,389.54, 1,917.36 and 799.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.54 : 1,917.36 = 799.96 : x
2. Step 2: Convert to fraction form
   1,389.54/1,917.36 = 799.96/x
3. Step 3: Cross multiply
   1,389.54x = 1,917.36 × 799.96
4. Step 4: Simplify right side
   1,389.54x = 1,533,811.31
5. Step 5: Solve for x
   x = 1,533,811.31/1,389.54
6. Step 6: Final answer
   x = 1,103.83