Finding the Fourth Proportional to 1,144.34, 1,579.20 and 620.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.34 : 1,579.20 = 620.38 : x
2. Step 2: Convert to fraction form
   1,144.34/1,579.20 = 620.38/x
3. Step 3: Cross multiply
   1,144.34x = 1,579.20 × 620.38
4. Step 4: Simplify right side
   1,144.34x = 979,704.10
5. Step 5: Solve for x
   x = 979,704.10/1,144.34
6. Step 6: Final answer
   x = 856.13