Finding the Fourth Proportional to 1,136.64, 1,568.52 and 664.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.64 : 1,568.52 = 664.50 : x
2. Step 2: Convert to fraction form
   1,136.64/1,568.52 = 664.50/x
3. Step 3: Cross multiply
   1,136.64x = 1,568.52 × 664.50
4. Step 4: Simplify right side
   1,136.64x = 1,042,281.54
5. Step 5: Solve for x
   x = 1,042,281.54/1,136.64
6. Step 6: Final answer
   x = 916.98