Finding the Fourth Proportional to 2,231.61, 3,079.38 and 1,236.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.61 : 3,079.38 = 1,236.72 : x
2. Step 2: Convert to fraction form
   2,231.61/3,079.38 = 1,236.72/x
3. Step 3: Cross multiply
   2,231.61x = 3,079.38 × 1,236.72
4. Step 4: Simplify right side
   2,231.61x = 3,808,330.83
5. Step 5: Solve for x
   x = 3,808,330.83/2,231.61
6. Step 6: Final answer
   x = 1,706.54