Finding the Fourth Proportional to 2,056.80, 3,086.28 and 1,236.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,056.80 : 3,086.28 = 1,236.72 : x
2. Step 2: Convert to fraction form
   2,056.80/3,086.28 = 1,236.72/x
3. Step 3: Cross multiply
   2,056.80x = 3,086.28 × 1,236.72
4. Step 4: Simplify right side
   2,056.80x = 3,816,864.20
5. Step 5: Solve for x
   x = 3,816,864.20/2,056.80
6. Step 6: Final answer
   x = 1,855.73