Finding the Fourth Proportional to 1,169.47, 1,613.76 and 645.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.47 : 1,613.76 = 645.49 : x
2. Step 2: Convert to fraction form
   1,169.47/1,613.76 = 645.49/x
3. Step 3: Cross multiply
   1,169.47x = 1,613.76 × 645.49
4. Step 4: Simplify right side
   1,169.47x = 1,041,665.94
5. Step 5: Solve for x
   x = 1,041,665.94/1,169.47
6. Step 6: Final answer
   x = 890.72