Finding the Fourth Proportional to 1,165.50, 1,608.37 and 641.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.50 : 1,608.37 = 641.52 : x
2. Step 2: Convert to fraction form
   1,165.50/1,608.37 = 641.52/x
3. Step 3: Cross multiply
   1,165.50x = 1,608.37 × 641.52
4. Step 4: Simplify right side
   1,165.50x = 1,031,798.31
5. Step 5: Solve for x
   x = 1,031,798.31/1,165.50
6. Step 6: Final answer
   x = 885.28