Finding the Fourth Proportional to 111.01, 153.06 and 72.13

Step by Step Solution

1. Step 1: Write the proportion equation
   111.01 : 153.06 = 72.13 : x
2. Step 2: Convert to fraction form
   111.01/153.06 = 72.13/x
3. Step 3: Cross multiply
   111.01x = 153.06 × 72.13
4. Step 4: Simplify right side
   111.01x = 11,040.22
5. Step 5: Solve for x
   x = 11,040.22/111.01
6. Step 6: Final answer
   x = 99.45