Finding the Fourth Proportional to 1,169.82, 1,614.27 and 645.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.82 : 1,614.27 = 645.78 : x
2. Step 2: Convert to fraction form
   1,169.82/1,614.27 = 645.78/x
3. Step 3: Cross multiply
   1,169.82x = 1,614.27 × 645.78
4. Step 4: Simplify right side
   1,169.82x = 1,042,463.28
5. Step 5: Solve for x
   x = 1,042,463.28/1,169.82
6. Step 6: Final answer
   x = 891.13