Finding the Fourth Proportional to 2,236.72, 3,086.72 and 1,228.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,236.72 : 3,086.72 = 1,228.47 : x
2. Step 2: Convert to fraction form
   2,236.72/3,086.72 = 1,228.47/x
3. Step 3: Cross multiply
   2,236.72x = 3,086.72 × 1,228.47
4. Step 4: Simplify right side
   2,236.72x = 3,791,942.92
5. Step 5: Solve for x
   x = 3,791,942.92/2,236.72
6. Step 6: Final answer
   x = 1,695.31