Finding the Fourth Proportional to 101.19, 139.55 and 72.03

Step by Step Solution

1. Step 1: Write the proportion equation
   101.19 : 139.55 = 72.03 : x
2. Step 2: Convert to fraction form
   101.19/139.55 = 72.03/x
3. Step 3: Cross multiply
   101.19x = 139.55 × 72.03
4. Step 4: Simplify right side
   101.19x = 10,051.43
5. Step 5: Solve for x
   x = 10,051.43/101.19
6. Step 6: Final answer
   x = 99.33