Finding the Fourth Proportional to 1,096.74, 1,643.49 and 609.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.74 : 1,643.49 = 609.12 : x
2. Step 2: Convert to fraction form
   1,096.74/1,643.49 = 609.12/x
3. Step 3: Cross multiply
   1,096.74x = 1,643.49 × 609.12
4. Step 4: Simplify right side
   1,096.74x = 1,001,082.63
5. Step 5: Solve for x
   x = 1,001,082.63/1,096.74
6. Step 6: Final answer
   x = 912.78