Finding the Fourth Proportional to 1,136.33, 1,568.24 and 638.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.33 : 1,568.24 = 638.96 : x
2. Step 2: Convert to fraction form
   1,136.33/1,568.24 = 638.96/x
3. Step 3: Cross multiply
   1,136.33x = 1,568.24 × 638.96
4. Step 4: Simplify right side
   1,136.33x = 1,002,031.59
5. Step 5: Solve for x
   x = 1,002,031.59/1,136.33
6. Step 6: Final answer
   x = 881.82