Finding the Fourth Proportional to 116.78, 161.18 and 67.69

Step by Step Solution

1. Step 1: Write the proportion equation
   116.78 : 161.18 = 67.69 : x
2. Step 2: Convert to fraction form
   116.78/161.18 = 67.69/x
3. Step 3: Cross multiply
   116.78x = 161.18 × 67.69
4. Step 4: Simplify right side
   116.78x = 10,909.47
5. Step 5: Solve for x
   x = 10,909.47/116.78
6. Step 6: Final answer
   x = 93.42