Finding the Fourth Proportional to 1,389.15, 1,917.03 and 759.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.15 : 1,917.03 = 759.69 : x
2. Step 2: Convert to fraction form
   1,389.15/1,917.03 = 759.69/x
3. Step 3: Cross multiply
   1,389.15x = 1,917.03 × 759.69
4. Step 4: Simplify right side
   1,389.15x = 1,456,338.94
5. Step 5: Solve for x
   x = 1,456,338.94/1,389.15
6. Step 6: Final answer
   x = 1,048.37