Finding the Fourth Proportional to 108.72, 149.98 and 69.42

Step by Step Solution

1. Step 1: Write the proportion equation
   108.72 : 149.98 = 69.42 : x
2. Step 2: Convert to fraction form
   108.72/149.98 = 69.42/x
3. Step 3: Cross multiply
   108.72x = 149.98 × 69.42
4. Step 4: Simplify right side
   108.72x = 10,411.61
5. Step 5: Solve for x
   x = 10,411.61/108.72
6. Step 6: Final answer
   x = 95.77