Finding the Fourth Proportional to 131.42, 181.43 and 100.34

Step by Step Solution

1. Step 1: Write the proportion equation
   131.42 : 181.43 = 100.34 : x
2. Step 2: Convert to fraction form
   131.42/181.43 = 100.34/x
3. Step 3: Cross multiply
   131.42x = 181.43 × 100.34
4. Step 4: Simplify right side
   131.42x = 18,204.69
5. Step 5: Solve for x
   x = 18,204.69/131.42
6. Step 6: Final answer
   x = 138.52