Finding the Fourth Proportional to 1,961.33, 2,707.52 and 1,216.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,961.33 : 2,707.52 = 1,216.31 : x
2. Step 2: Convert to fraction form
   1,961.33/2,707.52 = 1,216.31/x
3. Step 3: Cross multiply
   1,961.33x = 2,707.52 × 1,216.31
4. Step 4: Simplify right side
   1,961.33x = 3,293,164.03
5. Step 5: Solve for x
   x = 3,293,164.03/1,961.33
6. Step 6: Final answer
   x = 1,679.05