Finding the Fourth Proportional to 131.69, 181.59 and 100.25

Step by Step Solution

1. Step 1: Write the proportion equation
   131.69 : 181.59 = 100.25 : x
2. Step 2: Convert to fraction form
   131.69/181.59 = 100.25/x
3. Step 3: Cross multiply
   131.69x = 181.59 × 100.25
4. Step 4: Simplify right side
   131.69x = 18,204.40
5. Step 5: Solve for x
   x = 18,204.40/131.69
6. Step 6: Final answer
   x = 138.24