Finding the Fourth Proportional to 92.91, 139.89 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   92.91 : 139.89 = 72.72 : x
2. Step 2: Convert to fraction form
   92.91/139.89 = 72.72/x
3. Step 3: Cross multiply
   92.91x = 139.89 × 72.72
4. Step 4: Simplify right side
   92.91x = 10,172.80
5. Step 5: Solve for x
   x = 10,172.80/92.91
6. Step 6: Final answer
   x = 109.49