Finding the Fourth Proportional to 69.83, 104.69 and 51.81

Step by Step Solution

1. Step 1: Write the proportion equation
   69.83 : 104.69 = 51.81 : x
2. Step 2: Convert to fraction form
   69.83/104.69 = 51.81/x
3. Step 3: Cross multiply
   69.83x = 104.69 × 51.81
4. Step 4: Simplify right side
   69.83x = 5,423.73
5. Step 5: Solve for x
   x = 5,423.73/69.83
6. Step 6: Final answer
   x = 77.68