Finding the Fourth Proportional to 1,388.60, 1,916.27 and 759.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.60 : 1,916.27 = 759.12 : x
2. Step 2: Convert to fraction form
   1,388.60/1,916.27 = 759.12/x
3. Step 3: Cross multiply
   1,388.60x = 1,916.27 × 759.12
4. Step 4: Simplify right side
   1,388.60x = 1,454,680.78
5. Step 5: Solve for x
   x = 1,454,680.78/1,388.60
6. Step 6: Final answer
   x = 1,047.59