Finding the Fourth Proportional to 67.78, 101.72 and 49.47

Step by Step Solution

1. Step 1: Write the proportion equation
   67.78 : 101.72 = 49.47 : x
2. Step 2: Convert to fraction form
   67.78/101.72 = 49.47/x
3. Step 3: Cross multiply
   67.78x = 101.72 × 49.47
4. Step 4: Simplify right side
   67.78x = 5,032.09
5. Step 5: Solve for x
   x = 5,032.09/67.78
6. Step 6: Final answer
   x = 74.24