Finding the Fourth Proportional to 72.45, 108.61 and 42.01

Step by Step Solution

1. Step 1: Write the proportion equation
   72.45 : 108.61 = 42.01 : x
2. Step 2: Convert to fraction form
   72.45/108.61 = 42.01/x
3. Step 3: Cross multiply
   72.45x = 108.61 × 42.01
4. Step 4: Simplify right side
   72.45x = 4,562.33
5. Step 5: Solve for x
   x = 4,562.33/72.45
6. Step 6: Final answer
   x = 62.97