Finding the Fourth Proportional to 71.09, 105.77 and 69.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71.09 : 105.77 = 69.72 : x
2. Step 2: Convert to fraction form
   71.09/105.77 = 69.72/x
3. Step 3: Cross multiply
   71.09x = 105.77 × 69.72
4. Step 4: Simplify right side
   71.09x = 7,373.94
5. Step 5: Solve for x
   x = 7,373.94/71.09
6. Step 6: Final answer
   x = 103.73