Finding the Fourth Proportional to 2,006.72, 2,769.72 and 1,220.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,006.72 : 2,769.72 = 1,220.60 : x
2. Step 2: Convert to fraction form
   2,006.72/2,769.72 = 1,220.60/x
3. Step 3: Cross multiply
   2,006.72x = 2,769.72 × 1,220.60
4. Step 4: Simplify right side
   2,006.72x = 3,380,720.23
5. Step 5: Solve for x
   x = 3,380,720.23/2,006.72
6. Step 6: Final answer
   x = 1,684.70