Finding the Fourth Proportional to 3,168.72, 4,749.84 and 1,220.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,168.72 : 4,749.84 = 1,220.16 : x
2. Step 2: Convert to fraction form
   3,168.72/4,749.84 = 1,220.16/x
3. Step 3: Cross multiply
   3,168.72x = 4,749.84 × 1,220.16
4. Step 4: Simplify right side
   3,168.72x = 5,795,564.77
5. Step 5: Solve for x
   x = 5,795,564.77/3,168.72
6. Step 6: Final answer
   x = 1,828.99