Finding the Fourth Proportional to 109.77, 151.49 and 72.43

Step by Step Solution

1. Step 1: Write the proportion equation
   109.77 : 151.49 = 72.43 : x
2. Step 2: Convert to fraction form
   109.77/151.49 = 72.43/x
3. Step 3: Cross multiply
   109.77x = 151.49 × 72.43
4. Step 4: Simplify right side
   109.77x = 10,972.42
5. Step 5: Solve for x
   x = 10,972.42/109.77
6. Step 6: Final answer
   x = 99.96