Finding the Fourth Proportional to 131.35, 196.91 and 67.15

Step by Step Solution

1. Step 1: Write the proportion equation
   131.35 : 196.91 = 67.15 : x
2. Step 2: Convert to fraction form
   131.35/196.91 = 67.15/x
3. Step 3: Cross multiply
   131.35x = 196.91 × 67.15
4. Step 4: Simplify right side
   131.35x = 13,222.17
5. Step 5: Solve for x
   x = 13,222.17/131.35
6. Step 6: Final answer
   x = 100.66