Finding the Fourth Proportional to 1,009.18, 1,392.42 and 616.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.18 : 1,392.42 = 616.06 : x
2. Step 2: Convert to fraction form
   1,009.18/1,392.42 = 616.06/x
3. Step 3: Cross multiply
   1,009.18x = 1,392.42 × 616.06
4. Step 4: Simplify right side
   1,009.18x = 857,814.27
5. Step 5: Solve for x
   x = 857,814.27/1,009.18
6. Step 6: Final answer
   x = 850.01