Finding the Fourth Proportional to 1,009.83, 1,393.89 and 616.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.83 : 1,393.89 = 616.89 : x
2. Step 2: Convert to fraction form
   1,009.83/1,393.89 = 616.89/x
3. Step 3: Cross multiply
   1,009.83x = 1,393.89 × 616.89
4. Step 4: Simplify right side
   1,009.83x = 859,876.80
5. Step 5: Solve for x
   x = 859,876.80/1,009.83
6. Step 6: Final answer
   x = 851.51