Finding the Fourth Proportional to 1,389.50, 1,917.25 and 799.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.50 : 1,917.25 = 799.82 : x
2. Step 2: Convert to fraction form
   1,389.50/1,917.25 = 799.82/x
3. Step 3: Cross multiply
   1,389.50x = 1,917.25 × 799.82
4. Step 4: Simplify right side
   1,389.50x = 1,533,441.31
5. Step 5: Solve for x
   x = 1,533,441.31/1,389.50
6. Step 6: Final answer
   x = 1,103.60