Finding the Fourth Proportional to 73.21, 109.72 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   73.21 : 109.72 = 42.71 : x
2. Step 2: Convert to fraction form
   73.21/109.72 = 42.71/x
3. Step 3: Cross multiply
   73.21x = 109.72 × 42.71
4. Step 4: Simplify right side
   73.21x = 4,686.14
5. Step 5: Solve for x
   x = 4,686.14/73.21
6. Step 6: Final answer
   x = 64.01