Finding the Fourth Proportional to 1,388.81, 1,916.59 and 759.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.81 : 1,916.59 = 759.35 : x
2. Step 2: Convert to fraction form
   1,388.81/1,916.59 = 759.35/x
3. Step 3: Cross multiply
   1,388.81x = 1,916.59 × 759.35
4. Step 4: Simplify right side
   1,388.81x = 1,455,362.62
5. Step 5: Solve for x
   x = 1,455,362.62/1,388.81
6. Step 6: Final answer
   x = 1,047.92