Finding the Fourth Proportional to 2,018.12, 2,784.34 and 1,231.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.12 : 2,784.34 = 1,231.88 : x
2. Step 2: Convert to fraction form
   2,018.12/2,784.34 = 1,231.88/x
3. Step 3: Cross multiply
   2,018.12x = 2,784.34 × 1,231.88
4. Step 4: Simplify right side
   2,018.12x = 3,429,972.76
5. Step 5: Solve for x
   x = 3,429,972.76/2,018.12
6. Step 6: Final answer
   x = 1,699.59