Finding the Fourth Proportional to 2,007.18, 2,769.89 and 1,220.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.18 : 2,769.89 = 1,220.67 : x
2. Step 2: Convert to fraction form
   2,007.18/2,769.89 = 1,220.67/x
3. Step 3: Cross multiply
   2,007.18x = 2,769.89 × 1,220.67
4. Step 4: Simplify right side
   2,007.18x = 3,381,115.52
5. Step 5: Solve for x
   x = 3,381,115.52/2,007.18
6. Step 6: Final answer
   x = 1,684.51