Finding the Fourth Proportional to 101.07, 139.50 and 72.05

Step by Step Solution

1. Step 1: Write the proportion equation
   101.07 : 139.50 = 72.05 : x
2. Step 2: Convert to fraction form
   101.07/139.50 = 72.05/x
3. Step 3: Cross multiply
   101.07x = 139.50 × 72.05
4. Step 4: Simplify right side
   101.07x = 10,050.28
5. Step 5: Solve for x
   x = 10,050.28/101.07
6. Step 6: Final answer
   x = 99.44