Finding the Fourth Proportional to 1,008.01, 1,391.40 and 609.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.01 : 1,391.40 = 609.89 : x
2. Step 2: Convert to fraction form
   1,008.01/1,391.40 = 609.89/x
3. Step 3: Cross multiply
   1,008.01x = 1,391.40 × 609.89
4. Step 4: Simplify right side
   1,008.01x = 848,604.42
5. Step 5: Solve for x
   x = 848,604.42/1,008.01
6. Step 6: Final answer
   x = 841.86