Finding the Fourth Proportional to 1,389.08, 1,916.91 and 759.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.08 : 1,916.91 = 759.61 : x
2. Step 2: Convert to fraction form
   1,389.08/1,916.91 = 759.61/x
3. Step 3: Cross multiply
   1,389.08x = 1,916.91 × 759.61
4. Step 4: Simplify right side
   1,389.08x = 1,456,104.01
5. Step 5: Solve for x
   x = 1,456,104.01/1,389.08
6. Step 6: Final answer
   x = 1,048.25