Finding the Fourth Proportional to 2,007.02, 2,769.51 and 1,221.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.02 : 2,769.51 = 1,221.02 : x
2. Step 2: Convert to fraction form
   2,007.02/2,769.51 = 1,221.02/x
3. Step 3: Cross multiply
   2,007.02x = 2,769.51 × 1,221.02
4. Step 4: Simplify right side
   2,007.02x = 3,381,627.10
5. Step 5: Solve for x
   x = 3,381,627.10/2,007.02
6. Step 6: Final answer
   x = 1,684.90