Finding the Fourth Proportional to 67.18, 100.78 and 45.76

Step by Step Solution

1. Step 1: Write the proportion equation
   67.18 : 100.78 = 45.76 : x
2. Step 2: Convert to fraction form
   67.18/100.78 = 45.76/x
3. Step 3: Cross multiply
   67.18x = 100.78 × 45.76
4. Step 4: Simplify right side
   67.18x = 4,611.69
5. Step 5: Solve for x
   x = 4,611.69/67.18
6. Step 6: Final answer
   x = 68.65