Finding the Fourth Proportional to 72.96, 100.64 and 59.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.96 : 100.64 = 59.12 : x
2. Step 2: Convert to fraction form
   72.96/100.64 = 59.12/x
3. Step 3: Cross multiply
   72.96x = 100.64 × 59.12
4. Step 4: Simplify right side
   72.96x = 5,949.84
5. Step 5: Solve for x
   x = 5,949.84/72.96
6. Step 6: Final answer
   x = 81.55