Finding the Fourth Proportional to 2,148.24, 2,964.64 and 1,216.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.24 : 2,964.64 = 1,216.76 : x
2. Step 2: Convert to fraction form
   2,148.24/2,964.64 = 1,216.76/x
3. Step 3: Cross multiply
   2,148.24x = 2,964.64 × 1,216.76
4. Step 4: Simplify right side
   2,148.24x = 3,607,255.37
5. Step 5: Solve for x
   x = 3,607,255.37/2,148.24
6. Step 6: Final answer
   x = 1,679.17