Finding the Fourth Proportional to 72.80, 109.14 and 69.83

Step by Step Solution

1. Step 1: Write the proportion equation
   72.80 : 109.14 = 69.83 : x
2. Step 2: Convert to fraction form
   72.80/109.14 = 69.83/x
3. Step 3: Cross multiply
   72.80x = 109.14 × 69.83
4. Step 4: Simplify right side
   72.80x = 7,620.70
5. Step 5: Solve for x
   x = 7,620.70/72.80
6. Step 6: Final answer
   x = 104.69