Finding the Fourth Proportional to 111.32, 153.62 and 72.02

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.62 = 72.02 : x
2. Step 2: Convert to fraction form
   111.32/153.62 = 72.02/x
3. Step 3: Cross multiply
   111.32x = 153.62 × 72.02
4. Step 4: Simplify right side
   111.32x = 11,063.71
5. Step 5: Solve for x
   x = 11,063.71/111.32
6. Step 6: Final answer
   x = 99.39