Finding the Fourth Proportional to 131.29, 196.63 and 100.61

Step by Step Solution

1. Step 1: Write the proportion equation
   131.29 : 196.63 = 100.61 : x
2. Step 2: Convert to fraction form
   131.29/196.63 = 100.61/x
3. Step 3: Cross multiply
   131.29x = 196.63 × 100.61
4. Step 4: Simplify right side
   131.29x = 19,783.56
5. Step 5: Solve for x
   x = 19,783.56/131.29
6. Step 6: Final answer
   x = 150.68