Finding the Fourth Proportional to 1,382.78, 1,907.46 and 910.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.78 : 1,907.46 = 910.75 : x
2. Step 2: Convert to fraction form
   1,382.78/1,907.46 = 910.75/x
3. Step 3: Cross multiply
   1,382.78x = 1,907.46 × 910.75
4. Step 4: Simplify right side
   1,382.78x = 1,737,219.20
5. Step 5: Solve for x
   x = 1,737,219.20/1,382.78
6. Step 6: Final answer
   x = 1,256.32