Finding the Fourth Proportional to 131.34, 181.25 and 72.33

Step by Step Solution

1. Step 1: Write the proportion equation
   131.34 : 181.25 = 72.33 : x
2. Step 2: Convert to fraction form
   131.34/181.25 = 72.33/x
3. Step 3: Cross multiply
   131.34x = 181.25 × 72.33
4. Step 4: Simplify right side
   131.34x = 13,109.45
5. Step 5: Solve for x
   x = 13,109.45/131.34
6. Step 6: Final answer
   x = 99.81