Finding the Fourth Proportional to 1,219.36, 1,682.89 and 722.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,219.36 : 1,682.89 = 722.42 : x
2. Step 2: Convert to fraction form
   1,219.36/1,682.89 = 722.42/x
3. Step 3: Cross multiply
   1,219.36x = 1,682.89 × 722.42
4. Step 4: Simplify right side
   1,219.36x = 1,215,749.78
5. Step 5: Solve for x
   x = 1,215,749.78/1,219.36
6. Step 6: Final answer
   x = 997.04