Finding the Fourth Proportional to 72.99, 108.93 and 64.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 108.93 = 64.89 : x
2. Step 2: Convert to fraction form
   72.99/108.93 = 64.89/x
3. Step 3: Cross multiply
   72.99x = 108.93 × 64.89
4. Step 4: Simplify right side
   72.99x = 7,068.47
5. Step 5: Solve for x
   x = 7,068.47/72.99
6. Step 6: Final answer
   x = 96.84