Finding the Fourth Proportional to 2,180.12, 3,008.56 and 1,236.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.12 : 3,008.56 = 1,236.09 : x
2. Step 2: Convert to fraction form
   2,180.12/3,008.56 = 1,236.09/x
3. Step 3: Cross multiply
   2,180.12x = 3,008.56 × 1,236.09
4. Step 4: Simplify right side
   2,180.12x = 3,718,861.44
5. Step 5: Solve for x
   x = 3,718,861.44/2,180.12
6. Step 6: Final answer
   x = 1,705.81