Finding the Fourth Proportional to 1,169.35, 1,613.72 and 645.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.35 : 1,613.72 = 645.34 : x
2. Step 2: Convert to fraction form
   1,169.35/1,613.72 = 645.34/x
3. Step 3: Cross multiply
   1,169.35x = 1,613.72 × 645.34
4. Step 4: Simplify right side
   1,169.35x = 1,041,398.06
5. Step 5: Solve for x
   x = 1,041,398.06/1,169.35
6. Step 6: Final answer
   x = 890.58