Finding the Fourth Proportional to 1,165.25, 1,608.05 and 641.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.25 : 1,608.05 = 641.27 : x
2. Step 2: Convert to fraction form
   1,165.25/1,608.05 = 641.27/x
3. Step 3: Cross multiply
   1,165.25x = 1,608.05 × 641.27
4. Step 4: Simplify right side
   1,165.25x = 1,031,191.02
5. Step 5: Solve for x
   x = 1,031,191.02/1,165.25
6. Step 6: Final answer
   x = 884.95