Finding the Fourth Proportional to 67.45, 100.69 and 57.19

Step by Step Solution

1. Step 1: Write the proportion equation
   67.45 : 100.69 = 57.19 : x
2. Step 2: Convert to fraction form
   67.45/100.69 = 57.19/x
3. Step 3: Cross multiply
   67.45x = 100.69 × 57.19
4. Step 4: Simplify right side
   67.45x = 5,758.46
5. Step 5: Solve for x
   x = 5,758.46/67.45
6. Step 6: Final answer
   x = 85.37