Finding the Fourth Proportional to 101.30, 139.83 and 72.32

Step by Step Solution

1. Step 1: Write the proportion equation
   101.30 : 139.83 = 72.32 : x
2. Step 2: Convert to fraction form
   101.30/139.83 = 72.32/x
3. Step 3: Cross multiply
   101.30x = 139.83 × 72.32
4. Step 4: Simplify right side
   101.30x = 10,112.51
5. Step 5: Solve for x
   x = 10,112.51/101.30
6. Step 6: Final answer
   x = 99.83