Finding the Fourth Proportional to 101.10, 139.56 and 72.03

Step by Step Solution

1. Step 1: Write the proportion equation
   101.10 : 139.56 = 72.03 : x
2. Step 2: Convert to fraction form
   101.10/139.56 = 72.03/x
3. Step 3: Cross multiply
   101.10x = 139.56 × 72.03
4. Step 4: Simplify right side
   101.10x = 10,052.51
5. Step 5: Solve for x
   x = 10,052.51/101.10
6. Step 6: Final answer
   x = 99.43