Finding the Fourth Proportional to 2,187.68, 3,018.88 and 1,243.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.68 : 3,018.88 = 1,243.42 : x
2. Step 2: Convert to fraction form
   2,187.68/3,018.88 = 1,243.42/x
3. Step 3: Cross multiply
   2,187.68x = 3,018.88 × 1,243.42
4. Step 4: Simplify right side
   2,187.68x = 3,753,735.77
5. Step 5: Solve for x
   x = 3,753,735.77/2,187.68
6. Step 6: Final answer
   x = 1,715.85