Finding the Fourth Proportional to 67.39, 100.60 and 57.15

Step by Step Solution

1. Step 1: Write the proportion equation
   67.39 : 100.60 = 57.15 : x
2. Step 2: Convert to fraction form
   67.39/100.60 = 57.15/x
3. Step 3: Cross multiply
   67.39x = 100.60 × 57.15
4. Step 4: Simplify right side
   67.39x = 5,749.00
5. Step 5: Solve for x
   x = 5,749.00/67.39
6. Step 6: Final answer
   x = 85.31