Finding the Fourth Proportional to 1,116.33, 1,665.71 and 985.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.33 : 1,665.71 = 985.11 : x
2. Step 2: Convert to fraction form
   1,116.33/1,665.71 = 985.11/x
3. Step 3: Cross multiply
   1,116.33x = 1,665.71 × 985.11
4. Step 4: Simplify right side
   1,116.33x = 1,640,902.65
5. Step 5: Solve for x
   x = 1,640,902.65/1,116.33
6. Step 6: Final answer
   x = 1,469.91