Finding the Fourth Proportional to 91.89, 137.82 and 61.49

Step by Step Solution

1. Step 1: Write the proportion equation
   91.89 : 137.82 = 61.49 : x
2. Step 2: Convert to fraction form
   91.89/137.82 = 61.49/x
3. Step 3: Cross multiply
   91.89x = 137.82 × 61.49
4. Step 4: Simplify right side
   91.89x = 8,473.86
5. Step 5: Solve for x
   x = 8,473.86/91.89
6. Step 6: Final answer
   x = 92.22