Finding the Fourth Proportional to 105.01, 145.07 and 72.43

Step by Step Solution

1. Step 1: Write the proportion equation
   105.01 : 145.07 = 72.43 : x
2. Step 2: Convert to fraction form
   105.01/145.07 = 72.43/x
3. Step 3: Cross multiply
   105.01x = 145.07 × 72.43
4. Step 4: Simplify right side
   105.01x = 10,507.24
5. Step 5: Solve for x
   x = 10,507.24/105.01
6. Step 6: Final answer
   x = 100.06