Finding the Fourth Proportional to 131.10, 196.59 and 87.82

Step by Step Solution

1. Step 1: Write the proportion equation
   131.10 : 196.59 = 87.82 : x
2. Step 2: Convert to fraction form
   131.10/196.59 = 87.82/x
3. Step 3: Cross multiply
   131.10x = 196.59 × 87.82
4. Step 4: Simplify right side
   131.10x = 17,264.92
5. Step 5: Solve for x
   x = 17,264.92/131.10
6. Step 6: Final answer
   x = 131.69