Finding the Fourth Proportional to 105.72, 145.89 and 62.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 145.89 = 62.07 : x
2. Step 2: Convert to fraction form
   105.72/145.89 = 62.07/x
3. Step 3: Cross multiply
   105.72x = 145.89 × 62.07
4. Step 4: Simplify right side
   105.72x = 9,055.39
5. Step 5: Solve for x
   x = 9,055.39/105.72
6. Step 6: Final answer
   x = 85.65