Finding the Fourth Proportional to 61.49, 91.76 and 55.42

Step by Step Solution

1. Step 1: Write the proportion equation
   61.49 : 91.76 = 55.42 : x
2. Step 2: Convert to fraction form
   61.49/91.76 = 55.42/x
3. Step 3: Cross multiply
   61.49x = 91.76 × 55.42
4. Step 4: Simplify right side
   61.49x = 5,084.83
5. Step 5: Solve for x
   x = 5,084.83/61.49
6. Step 6: Final answer
   x = 82.69