Finding the Fourth Proportional to 1,144.52, 1,579.42 and 620.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.52 : 1,579.42 = 620.54 : x
2. Step 2: Convert to fraction form
   1,144.52/1,579.42 = 620.54/x
3. Step 3: Cross multiply
   1,144.52x = 1,579.42 × 620.54
4. Step 4: Simplify right side
   1,144.52x = 980,093.29
5. Step 5: Solve for x
   x = 980,093.29/1,144.52
6. Step 6: Final answer
   x = 856.34