Finding the Fourth Proportional to 1,388.58, 1,916.28 and 759.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.58 : 1,916.28 = 759.12 : x
2. Step 2: Convert to fraction form
   1,388.58/1,916.28 = 759.12/x
3. Step 3: Cross multiply
   1,388.58x = 1,916.28 × 759.12
4. Step 4: Simplify right side
   1,388.58x = 1,454,686.47
5. Step 5: Solve for x
   x = 1,454,686.47/1,388.58
6. Step 6: Final answer
   x = 1,047.61