Finding the Fourth Proportional to 1,388.54, 1,916.12 and 759.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.54 : 1,916.12 = 759.03 : x
2. Step 2: Convert to fraction form
   1,388.54/1,916.12 = 759.03/x
3. Step 3: Cross multiply
   1,388.54x = 1,916.12 × 759.03
4. Step 4: Simplify right side
   1,388.54x = 1,454,398.80
5. Step 5: Solve for x
   x = 1,454,398.80/1,388.54
6. Step 6: Final answer
   x = 1,047.43