Finding the Fourth Proportional to 105.32, 145.35 and 72.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105.32 : 145.35 = 72.59 : x
2. Step 2: Convert to fraction form
   105.32/145.35 = 72.59/x
3. Step 3: Cross multiply
   105.32x = 145.35 × 72.59
4. Step 4: Simplify right side
   105.32x = 10,550.96
5. Step 5: Solve for x
   x = 10,550.96/105.32
6. Step 6: Final answer
   x = 100.18