Finding the Fourth Proportional to 2,141.70, 3,212.41 and 1,320.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.70 : 3,212.41 = 1,320.09 : x
2. Step 2: Convert to fraction form
   2,141.70/3,212.41 = 1,320.09/x
3. Step 3: Cross multiply
   2,141.70x = 3,212.41 × 1,320.09
4. Step 4: Simplify right side
   2,141.70x = 4,240,670.32
5. Step 5: Solve for x
   x = 4,240,670.32/2,141.70
6. Step 6: Final answer
   x = 1,980.05