Finding the Fourth Proportional to 72.78, 109.02 and 42.33

Step by Step Solution

1. Step 1: Write the proportion equation
   72.78 : 109.02 = 42.33 : x
2. Step 2: Convert to fraction form
   72.78/109.02 = 42.33/x
3. Step 3: Cross multiply
   72.78x = 109.02 × 42.33
4. Step 4: Simplify right side
   72.78x = 4,614.82
5. Step 5: Solve for x
   x = 4,614.82/72.78
6. Step 6: Final answer
   x = 63.41