Finding the Fourth Proportional to 72.88, 109.34 and 69.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 109.34 = 69.86 : x
2. Step 2: Convert to fraction form
   72.88/109.34 = 69.86/x
3. Step 3: Cross multiply
   72.88x = 109.34 × 69.86
4. Step 4: Simplify right side
   72.88x = 7,638.49
5. Step 5: Solve for x
   x = 7,638.49/72.88
6. Step 6: Final answer
   x = 104.81