Finding the Fourth Proportional to 67.77, 101.61 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   67.77 : 101.61 = 42.09 : x
2. Step 2: Convert to fraction form
   67.77/101.61 = 42.09/x
3. Step 3: Cross multiply
   67.77x = 101.61 × 42.09
4. Step 4: Simplify right side
   67.77x = 4,276.76
5. Step 5: Solve for x
   x = 4,276.76/67.77
6. Step 6: Final answer
   x = 63.11