Finding the Fourth Proportional to 1,009.07, 1,392.59 and 616.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.07 : 1,392.59 = 616.31 : x
2. Step 2: Convert to fraction form
   1,009.07/1,392.59 = 616.31/x
3. Step 3: Cross multiply
   1,009.07x = 1,392.59 × 616.31
4. Step 4: Simplify right side
   1,009.07x = 858,264.06
5. Step 5: Solve for x
   x = 858,264.06/1,009.07
6. Step 6: Final answer
   x = 850.55