Finding the Fourth Proportional to 1,167.24, 1,610.79 and 643.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.24 : 1,610.79 = 643.27 : x
2. Step 2: Convert to fraction form
   1,167.24/1,610.79 = 643.27/x
3. Step 3: Cross multiply
   1,167.24x = 1,610.79 × 643.27
4. Step 4: Simplify right side
   1,167.24x = 1,036,172.88
5. Step 5: Solve for x
   x = 1,036,172.88/1,167.24
6. Step 6: Final answer
   x = 887.71