Finding the Fourth Proportional to 1,009.50, 1,392.68 and 616.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.50 : 1,392.68 = 616.48 : x
2. Step 2: Convert to fraction form
   1,009.50/1,392.68 = 616.48/x
3. Step 3: Cross multiply
   1,009.50x = 1,392.68 × 616.48
4. Step 4: Simplify right side
   1,009.50x = 858,559.37
5. Step 5: Solve for x
   x = 858,559.37/1,009.50
6. Step 6: Final answer
   x = 850.48