Finding the Fourth Proportional to 2,008.45, 3,012.72 and 912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,008.45 : 3,012.72 = 912.72 : x
2. Step 2: Convert to fraction form
   2,008.45/3,012.72 = 912.72/x
3. Step 3: Cross multiply
   2,008.45x = 3,012.72 × 912.72
4. Step 4: Simplify right side
   2,008.45x = 2,749,769.80
5. Step 5: Solve for x
   x = 2,749,769.80/2,008.45
6. Step 6: Final answer
   x = 1,369.10