Finding the Fourth Proportional to 2,017.50, 2,784.18 and 1,231.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,017.50 : 2,784.18 = 1,231.38 : x
2. Step 2: Convert to fraction form
   2,017.50/2,784.18 = 1,231.38/x
3. Step 3: Cross multiply
   2,017.50x = 2,784.18 × 1,231.38
4. Step 4: Simplify right side
   2,017.50x = 3,428,383.57
5. Step 5: Solve for x
   x = 3,428,383.57/2,017.50
6. Step 6: Final answer
   x = 1,699.32