Finding the Fourth Proportional to 1,144.91, 1,579.98 and 620.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.91 : 1,579.98 = 620.94 : x
2. Step 2: Convert to fraction form
   1,144.91/1,579.98 = 620.94/x
3. Step 3: Cross multiply
   1,144.91x = 1,579.98 × 620.94
4. Step 4: Simplify right side
   1,144.91x = 981,072.78
5. Step 5: Solve for x
   x = 981,072.78/1,144.91
6. Step 6: Final answer
   x = 856.90