Finding the Fourth Proportional to 2,017.72, 2,784.60 and 1,231.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,017.72 : 2,784.60 = 1,231.92 : x
2. Step 2: Convert to fraction form
   2,017.72/2,784.60 = 1,231.92/x
3. Step 3: Cross multiply
   2,017.72x = 2,784.60 × 1,231.92
4. Step 4: Simplify right side
   2,017.72x = 3,430,404.43
5. Step 5: Solve for x
   x = 3,430,404.43/2,017.72
6. Step 6: Final answer
   x = 1,700.14