Finding the Fourth Proportional to 61.57, 92.72 and 54.42

Step by Step Solution

1. Step 1: Write the proportion equation
   61.57 : 92.72 = 54.42 : x
2. Step 2: Convert to fraction form
   61.57/92.72 = 54.42/x
3. Step 3: Cross multiply
   61.57x = 92.72 × 54.42
4. Step 4: Simplify right side
   61.57x = 5,045.82
5. Step 5: Solve for x
   x = 5,045.82/61.57
6. Step 6: Final answer
   x = 81.95