Finding the Fourth Proportional to 72.92, 109.24 and 42.47

Step by Step Solution

1. Step 1: Write the proportion equation
   72.92 : 109.24 = 42.47 : x
2. Step 2: Convert to fraction form
   72.92/109.24 = 42.47/x
3. Step 3: Cross multiply
   72.92x = 109.24 × 42.47
4. Step 4: Simplify right side
   72.92x = 4,639.59
5. Step 5: Solve for x
   x = 4,639.59/72.92
6. Step 6: Final answer
   x = 63.63