Finding the Fourth Proportional to 105.32, 145.17 and 72.51

Step by Step Solution

1. Step 1: Write the proportion equation
   105.32 : 145.17 = 72.51 : x
2. Step 2: Convert to fraction form
   105.32/145.17 = 72.51/x
3. Step 3: Cross multiply
   105.32x = 145.17 × 72.51
4. Step 4: Simplify right side
   105.32x = 10,526.28
5. Step 5: Solve for x
   x = 10,526.28/105.32
6. Step 6: Final answer
   x = 99.95