Finding the Fourth Proportional to 1,009.76, 1,393.46 and 616.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.76 : 1,393.46 = 616.72 : x
2. Step 2: Convert to fraction form
   1,009.76/1,393.46 = 616.72/x
3. Step 3: Cross multiply
   1,009.76x = 1,393.46 × 616.72
4. Step 4: Simplify right side
   1,009.76x = 859,374.65
5. Step 5: Solve for x
   x = 859,374.65/1,009.76
6. Step 6: Final answer
   x = 851.07