Finding the Fourth Proportional to 2,017.90, 2,784.52 and 1,231.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,017.90 : 2,784.52 = 1,231.79 : x
2. Step 2: Convert to fraction form
   2,017.90/2,784.52 = 1,231.79/x
3. Step 3: Cross multiply
   2,017.90x = 2,784.52 × 1,231.79
4. Step 4: Simplify right side
   2,017.90x = 3,429,943.89
5. Step 5: Solve for x
   x = 3,429,943.89/2,017.90
6. Step 6: Final answer
   x = 1,699.76