Finding the Fourth Proportional to 1,022.50, 1,411.18 and 608.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.50 : 1,411.18 = 608.50 : x
2. Step 2: Convert to fraction form
   1,022.50/1,411.18 = 608.50/x
3. Step 3: Cross multiply
   1,022.50x = 1,411.18 × 608.50
4. Step 4: Simplify right side
   1,022.50x = 858,703.03
5. Step 5: Solve for x
   x = 858,703.03/1,022.50
6. Step 6: Final answer
   x = 839.81