Finding the Fourth Proportional to 2,180.56, 3,009.82 and 1,296.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.56 : 3,009.82 = 1,296.90 : x
2. Step 2: Convert to fraction form
   2,180.56/3,009.82 = 1,296.90/x
3. Step 3: Cross multiply
   2,180.56x = 3,009.82 × 1,296.90
4. Step 4: Simplify right side
   2,180.56x = 3,903,435.56
5. Step 5: Solve for x
   x = 3,903,435.56/2,180.56
6. Step 6: Final answer
   x = 1,790.11