Finding the Fourth Proportional to 2,007.69, 3,012.96 and 912.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.69 : 3,012.96 = 912.20 : x
2. Step 2: Convert to fraction form
   2,007.69/3,012.96 = 912.20/x
3. Step 3: Cross multiply
   2,007.69x = 3,012.96 × 912.20
4. Step 4: Simplify right side
   2,007.69x = 2,748,410.47
5. Step 5: Solve for x
   x = 2,748,410.47/2,007.69
6. Step 6: Final answer
   x = 1,368.94