Finding the Fourth Proportional to 72.72, 100.56 and 64.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 100.56 = 64.32 : x
2. Step 2: Convert to fraction form
   72.72/100.56 = 64.32/x
3. Step 3: Cross multiply
   72.72x = 100.56 × 64.32
4. Step 4: Simplify right side
   72.72x = 6,468.02
5. Step 5: Solve for x
   x = 6,468.02/72.72
6. Step 6: Final answer
   x = 88.94