Finding the Fourth Proportional to 1,144.03, 1,578.76 and 620.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.03 : 1,578.76 = 620.07 : x
2. Step 2: Convert to fraction form
   1,144.03/1,578.76 = 620.07/x
3. Step 3: Cross multiply
   1,144.03x = 1,578.76 × 620.07
4. Step 4: Simplify right side
   1,144.03x = 978,941.71
5. Step 5: Solve for x
   x = 978,941.71/1,144.03
6. Step 6: Final answer
   x = 855.70