Finding the Fourth Proportional to 105.52, 145.71 and 72.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105.52 : 145.71 = 72.37 : x
2. Step 2: Convert to fraction form
   105.52/145.71 = 72.37/x
3. Step 3: Cross multiply
   105.52x = 145.71 × 72.37
4. Step 4: Simplify right side
   105.52x = 10,545.03
5. Step 5: Solve for x
   x = 10,545.03/105.52
6. Step 6: Final answer
   x = 99.93