Finding the Fourth Proportional to 2,147.76, 2,964.06 and 1,216.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.76 : 2,964.06 = 1,216.26 : x
2. Step 2: Convert to fraction form
   2,147.76/2,964.06 = 1,216.26/x
3. Step 3: Cross multiply
   2,147.76x = 2,964.06 × 1,216.26
4. Step 4: Simplify right side
   2,147.76x = 3,605,067.62
5. Step 5: Solve for x
   x = 3,605,067.62/2,147.76
6. Step 6: Final answer
   x = 1,678.52