Finding the Fourth Proportional to 72.78, 109.00 and 42.27

Step by Step Solution

1. Step 1: Write the proportion equation
   72.78 : 109.00 = 42.27 : x
2. Step 2: Convert to fraction form
   72.78/109.00 = 42.27/x
3. Step 3: Cross multiply
   72.78x = 109.00 × 42.27
4. Step 4: Simplify right side
   72.78x = 4,606.99
5. Step 5: Solve for x
   x = 4,606.99/72.78
6. Step 6: Final answer
   x = 63.30