Finding the Fourth Proportional to 1,144.50, 1,579.82 and 678.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.50 : 1,579.82 = 678.75 : x
2. Step 2: Convert to fraction form
   1,144.50/1,579.82 = 678.75/x
3. Step 3: Cross multiply
   1,144.50x = 1,579.82 × 678.75
4. Step 4: Simplify right side
   1,144.50x = 1,072,299.43
5. Step 5: Solve for x
   x = 1,072,299.43/1,144.50
6. Step 6: Final answer
   x = 936.92