Finding the Fourth Proportional to 1,185.42, 1,635.88 and 688.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.42 : 1,635.88 = 688.09 : x
2. Step 2: Convert to fraction form
   1,185.42/1,635.88 = 688.09/x
3. Step 3: Cross multiply
   1,185.42x = 1,635.88 × 688.09
4. Step 4: Simplify right side
   1,185.42x = 1,125,632.67
5. Step 5: Solve for x
   x = 1,125,632.67/1,185.42
6. Step 6: Final answer
   x = 949.56