Finding the Fourth Proportional to 91.69, 137.61 and 61.25

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 137.61 = 61.25 : x
2. Step 2: Convert to fraction form
   91.69/137.61 = 61.25/x
3. Step 3: Cross multiply
   91.69x = 137.61 × 61.25
4. Step 4: Simplify right side
   91.69x = 8,427.92
5. Step 5: Solve for x
   x = 8,427.92/91.69
6. Step 6: Final answer
   x = 91.92