Finding the Fourth Proportional to 111.06, 153.30 and 72.32

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 153.30 = 72.32 : x
2. Step 2: Convert to fraction form
   111.06/153.30 = 72.32/x
3. Step 3: Cross multiply
   111.06x = 153.30 × 72.32
4. Step 4: Simplify right side
   111.06x = 11,085.53
5. Step 5: Solve for x
   x = 11,085.53/111.06
6. Step 6: Final answer
   x = 99.82