Finding the Fourth Proportional to 1,169.56, 1,613.99 and 645.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.56 : 1,613.99 = 645.59 : x
2. Step 2: Convert to fraction form
   1,169.56/1,613.99 = 645.59/x
3. Step 3: Cross multiply
   1,169.56x = 1,613.99 × 645.59
4. Step 4: Simplify right side
   1,169.56x = 1,041,981.45
5. Step 5: Solve for x
   x = 1,041,981.45/1,169.56
6. Step 6: Final answer
   x = 890.92