Finding the Fourth Proportional to 67.46, 100.69 and 55.40

Step by Step Solution

1. Step 1: Write the proportion equation
   67.46 : 100.69 = 55.40 : x
2. Step 2: Convert to fraction form
   67.46/100.69 = 55.40/x
3. Step 3: Cross multiply
   67.46x = 100.69 × 55.40
4. Step 4: Simplify right side
   67.46x = 5,578.23
5. Step 5: Solve for x
   x = 5,578.23/67.46
6. Step 6: Final answer
   x = 82.69