Finding the Fourth Proportional to 72.99, 109.56 and 68.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 109.56 = 68.59 : x
2. Step 2: Convert to fraction form
   72.99/109.56 = 68.59/x
3. Step 3: Cross multiply
   72.99x = 109.56 × 68.59
4. Step 4: Simplify right side
   72.99x = 7,513.83
5. Step 5: Solve for x
   x = 7,513.83/72.99
6. Step 6: Final answer
   x = 102.94