Finding the Fourth Proportional to 67.50, 101.07 and 57.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67.50 : 101.07 = 57.78 : x
2. Step 2: Convert to fraction form
   67.50/101.07 = 57.78/x
3. Step 3: Cross multiply
   67.50x = 101.07 × 57.78
4. Step 4: Simplify right side
   67.50x = 5,839.82
5. Step 5: Solve for x
   x = 5,839.82/67.50
6. Step 6: Final answer
   x = 86.52