Finding the Fourth Proportional to 1,961.71, 2,708.42 and 1,216.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,961.71 : 2,708.42 = 1,216.46 : x
2. Step 2: Convert to fraction form
   1,961.71/2,708.42 = 1,216.46/x
3. Step 3: Cross multiply
   1,961.71x = 2,708.42 × 1,216.46
4. Step 4: Simplify right side
   1,961.71x = 3,294,684.59
5. Step 5: Solve for x
   x = 3,294,684.59/1,961.71
6. Step 6: Final answer
   x = 1,679.50