Finding the Fourth Proportional to 70.79, 105.53 and 67.55

Step by Step Solution

1. Step 1: Write the proportion equation
   70.79 : 105.53 = 67.55 : x
2. Step 2: Convert to fraction form
   70.79/105.53 = 67.55/x
3. Step 3: Cross multiply
   70.79x = 105.53 × 67.55
4. Step 4: Simplify right side
   70.79x = 7,127.69
5. Step 5: Solve for x
   x = 7,127.69/70.79
6. Step 6: Final answer
   x = 100.69