Finding the Fourth Proportional to 72.72, 100.26 and 64.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 100.26 = 64.98 : x
2. Step 2: Convert to fraction form
   72.72/100.26 = 64.98/x
3. Step 3: Cross multiply
   72.72x = 100.26 × 64.98
4. Step 4: Simplify right side
   72.72x = 6,514.89
5. Step 5: Solve for x
   x = 6,514.89/72.72
6. Step 6: Final answer
   x = 89.59