Finding the Fourth Proportional to 120.99, 181.31 and 72.25

Step by Step Solution

1. Step 1: Write the proportion equation
   120.99 : 181.31 = 72.25 : x
2. Step 2: Convert to fraction form
   120.99/181.31 = 72.25/x
3. Step 3: Cross multiply
   120.99x = 181.31 × 72.25
4. Step 4: Simplify right side
   120.99x = 13,100.72
5. Step 5: Solve for x
   x = 13,100.72/120.99
6. Step 6: Final answer
   x = 108.28