Finding the Fourth Proportional to 61.25, 91.89 and 54.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61.25 : 91.89 = 54.50 : x
2. Step 2: Convert to fraction form
   61.25/91.89 = 54.50/x
3. Step 3: Cross multiply
   61.25x = 91.89 × 54.50
4. Step 4: Simplify right side
   61.25x = 5,007.55
5. Step 5: Solve for x
   x = 5,007.55/61.25
6. Step 6: Final answer
   x = 81.76