Finding the Fourth Proportional to 72.77, 109.05 and 42.29

Step by Step Solution

1. Step 1: Write the proportion equation
   72.77 : 109.05 = 42.29 : x
2. Step 2: Convert to fraction form
   72.77/109.05 = 42.29/x
3. Step 3: Cross multiply
   72.77x = 109.05 × 42.29
4. Step 4: Simplify right side
   72.77x = 4,611.43
5. Step 5: Solve for x
   x = 4,611.43/72.77
6. Step 6: Final answer
   x = 63.37