Finding the Fourth Proportional to 1,009.70, 1,392.89 and 616.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.70 : 1,392.89 = 616.04 : x
2. Step 2: Convert to fraction form
   1,009.70/1,392.89 = 616.04/x
3. Step 3: Cross multiply
   1,009.70x = 1,392.89 × 616.04
4. Step 4: Simplify right side
   1,009.70x = 858,065.91
5. Step 5: Solve for x
   x = 858,065.91/1,009.70
6. Step 6: Final answer
   x = 849.83