Finding the Fourth Proportional to 90.72, 136.04 and 67.82

Step by Step Solution

1. Step 1: Write the proportion equation
   90.72 : 136.04 = 67.82 : x
2. Step 2: Convert to fraction form
   90.72/136.04 = 67.82/x
3. Step 3: Cross multiply
   90.72x = 136.04 × 67.82
4. Step 4: Simplify right side
   90.72x = 9,226.23
5. Step 5: Solve for x
   x = 9,226.23/90.72
6. Step 6: Final answer
   x = 101.70