Finding the Fourth Proportional to 1,169.89, 1,614.42 and 645.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.89 : 1,614.42 = 645.91 : x
2. Step 2: Convert to fraction form
   1,169.89/1,614.42 = 645.91/x
3. Step 3: Cross multiply
   1,169.89x = 1,614.42 × 645.91
4. Step 4: Simplify right side
   1,169.89x = 1,042,770.02
5. Step 5: Solve for x
   x = 1,042,770.02/1,169.89
6. Step 6: Final answer
   x = 891.34