Finding the Fourth Proportional to 1,002.22, 1,383.30 and 609.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.22 : 1,383.30 = 609.57 : x
2. Step 2: Convert to fraction form
   1,002.22/1,383.30 = 609.57/x
3. Step 3: Cross multiply
   1,002.22x = 1,383.30 × 609.57
4. Step 4: Simplify right side
   1,002.22x = 843,218.18
5. Step 5: Solve for x
   x = 843,218.18/1,002.22
6. Step 6: Final answer
   x = 841.35