Finding the Fourth Proportional to 1,136.16, 1,567.89 and 688.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.16 : 1,567.89 = 688.05 : x
2. Step 2: Convert to fraction form
   1,136.16/1,567.89 = 688.05/x
3. Step 3: Cross multiply
   1,136.16x = 1,567.89 × 688.05
4. Step 4: Simplify right side
   1,136.16x = 1,078,786.71
5. Step 5: Solve for x
   x = 1,078,786.71/1,136.16
6. Step 6: Final answer
   x = 949.50