Finding the Fourth Proportional to 1,169.25, 1,613.61 and 645.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.25 : 1,613.61 = 645.27 : x
2. Step 2: Convert to fraction form
   1,169.25/1,613.61 = 645.27/x
3. Step 3: Cross multiply
   1,169.25x = 1,613.61 × 645.27
4. Step 4: Simplify right side
   1,169.25x = 1,041,214.12
5. Step 5: Solve for x
   x = 1,041,214.12/1,169.25
6. Step 6: Final answer
   x = 890.50