Finding the Fourth Proportional to 1,388.86, 1,916.61 and 759.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.86 : 1,916.61 = 759.38 : x
2. Step 2: Convert to fraction form
   1,388.86/1,916.61 = 759.38/x
3. Step 3: Cross multiply
   1,388.86x = 1,916.61 × 759.38
4. Step 4: Simplify right side
   1,388.86x = 1,455,435.30
5. Step 5: Solve for x
   x = 1,455,435.30/1,388.86
6. Step 6: Final answer
   x = 1,047.94