Finding the Fourth Proportional to 1,144.47, 1,579.37 and 620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.47 : 1,579.37 = 620.50 : x
2. Step 2: Convert to fraction form
   1,144.47/1,579.37 = 620.50/x
3. Step 3: Cross multiply
   1,144.47x = 1,579.37 × 620.50
4. Step 4: Simplify right side
   1,144.47x = 979,999.09
5. Step 5: Solve for x
   x = 979,999.09/1,144.47
6. Step 6: Final answer
   x = 856.29