Finding the Fourth Proportional to 1,144.57, 1,579.50 and 620.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.57 : 1,579.50 = 620.59 : x
2. Step 2: Convert to fraction form
   1,144.57/1,579.50 = 620.59/x
3. Step 3: Cross multiply
   1,144.57x = 1,579.50 × 620.59
4. Step 4: Simplify right side
   1,144.57x = 980,221.91
5. Step 5: Solve for x
   x = 980,221.91/1,144.57
6. Step 6: Final answer
   x = 856.41