Finding the Fourth Proportional to 2,236.78, 3,086.81 and 1,242.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,236.78 : 3,086.81 = 1,242.12 : x
2. Step 2: Convert to fraction form
   2,236.78/3,086.81 = 1,242.12/x
3. Step 3: Cross multiply
   2,236.78x = 3,086.81 × 1,242.12
4. Step 4: Simplify right side
   2,236.78x = 3,834,193.80
5. Step 5: Solve for x
   x = 3,834,193.80/2,236.78
6. Step 6: Final answer
   x = 1,714.16