Finding the Fourth Proportional to 67.79, 101.61 and 57.53

Step by Step Solution

1. Step 1: Write the proportion equation
   67.79 : 101.61 = 57.53 : x
2. Step 2: Convert to fraction form
   67.79/101.61 = 57.53/x
3. Step 3: Cross multiply
   67.79x = 101.61 × 57.53
4. Step 4: Simplify right side
   67.79x = 5,845.12
5. Step 5: Solve for x
   x = 5,845.12/67.79
6. Step 6: Final answer
   x = 86.23