Finding the Fourth Proportional to 72.77, 100.24 and 72.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72.77 : 100.24 = 72.56 : x
2. Step 2: Convert to fraction form
   72.77/100.24 = 72.56/x
3. Step 3: Cross multiply
   72.77x = 100.24 × 72.56
4. Step 4: Simplify right side
   72.77x = 7,273.48
5. Step 5: Solve for x
   x = 7,273.48/72.77
6. Step 6: Final answer
   x = 99.96