Finding the Fourth Proportional to 1,144.79, 1,579.82 and 620.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.79 : 1,579.82 = 620.82 : x
2. Step 2: Convert to fraction form
   1,144.79/1,579.82 = 620.82/x
3. Step 3: Cross multiply
   1,144.79x = 1,579.82 × 620.82
4. Step 4: Simplify right side
   1,144.79x = 980,780.75
5. Step 5: Solve for x
   x = 980,780.75/1,144.79
6. Step 6: Final answer
   x = 856.74