Finding the Fourth Proportional to 72.77, 109.06 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.77 : 109.06 = 42.31 : x
2. Step 2: Convert to fraction form
   72.77/109.06 = 42.31/x
3. Step 3: Cross multiply
   72.77x = 109.06 × 42.31
4. Step 4: Simplify right side
   72.77x = 4,614.33
5. Step 5: Solve for x
   x = 4,614.33/72.77
6. Step 6: Final answer
   x = 63.41