Finding the Fourth Proportional to 69.77, 104.52 and 54.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69.77 : 104.52 = 54.50 : x
2. Step 2: Convert to fraction form
   69.77/104.52 = 54.50/x
3. Step 3: Cross multiply
   69.77x = 104.52 × 54.50
4. Step 4: Simplify right side
   69.77x = 5,695.82
5. Step 5: Solve for x
   x = 5,695.82/69.77
6. Step 6: Final answer
   x = 81.64