Finding the Fourth Proportional to 67.78, 101.49 and 56.38

Step by Step Solution

1. Step 1: Write the proportion equation
   67.78 : 101.49 = 56.38 : x
2. Step 2: Convert to fraction form
   67.78/101.49 = 56.38/x
3. Step 3: Cross multiply
   67.78x = 101.49 × 56.38
4. Step 4: Simplify right side
   67.78x = 5,722.01
5. Step 5: Solve for x
   x = 5,722.01/67.78
6. Step 6: Final answer
   x = 84.42