Finding the Fourth Proportional to 2,180.91, 3,009.47 and 1,236.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.91 : 3,009.47 = 1,236.78 : x
2. Step 2: Convert to fraction form
   2,180.91/3,009.47 = 1,236.78/x
3. Step 3: Cross multiply
   2,180.91x = 3,009.47 × 1,236.78
4. Step 4: Simplify right side
   2,180.91x = 3,722,046.12
5. Step 5: Solve for x
   x = 3,722,046.12/2,180.91
6. Step 6: Final answer
   x = 1,706.65