Finding the Fourth Proportional to 91.69, 137.31 and 61.22

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 137.31 = 61.22 : x
2. Step 2: Convert to fraction form
   91.69/137.31 = 61.22/x
3. Step 3: Cross multiply
   91.69x = 137.31 × 61.22
4. Step 4: Simplify right side
   91.69x = 8,406.12
5. Step 5: Solve for x
   x = 8,406.12/91.69
6. Step 6: Final answer
   x = 91.68