Finding the Fourth Proportional to 2,147.86, 2,964.05 and 1,216.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.86 : 2,964.05 = 1,216.36 : x
2. Step 2: Convert to fraction form
   2,147.86/2,964.05 = 1,216.36/x
3. Step 3: Cross multiply
   2,147.86x = 2,964.05 × 1,216.36
4. Step 4: Simplify right side
   2,147.86x = 3,605,338.37
5. Step 5: Solve for x
   x = 3,605,338.37/2,147.86
6. Step 6: Final answer
   x = 1,678.57