Finding the Fourth Proportional to 131.93, 196.72 and 128.34

Step by Step Solution

1. Step 1: Write the proportion equation
   131.93 : 196.72 = 128.34 : x
2. Step 2: Convert to fraction form
   131.93/196.72 = 128.34/x
3. Step 3: Cross multiply
   131.93x = 196.72 × 128.34
4. Step 4: Simplify right side
   131.93x = 25,246.72
5. Step 5: Solve for x
   x = 25,246.72/131.93
6. Step 6: Final answer
   x = 191.37