Finding the Fourth Proportional to 1,389.27, 1,917.18 and 759.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.27 : 1,917.18 = 759.81 : x
2. Step 2: Convert to fraction form
   1,389.27/1,917.18 = 759.81/x
3. Step 3: Cross multiply
   1,389.27x = 1,917.18 × 759.81
4. Step 4: Simplify right side
   1,389.27x = 1,456,692.54
5. Step 5: Solve for x
   x = 1,456,692.54/1,389.27
6. Step 6: Final answer
   x = 1,048.53