Finding the Fourth Proportional to 2,147.88, 2,963.97 and 1,216.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.88 : 2,963.97 = 1,216.38 : x
2. Step 2: Convert to fraction form
   2,147.88/2,963.97 = 1,216.38/x
3. Step 3: Cross multiply
   2,147.88x = 2,963.97 × 1,216.38
4. Step 4: Simplify right side
   2,147.88x = 3,605,313.83
5. Step 5: Solve for x
   x = 3,605,313.83/2,147.88
6. Step 6: Final answer
   x = 1,678.55