Finding the Fourth Proportional to 105.31, 157.91 and 61.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105.31 : 157.91 = 61.96 : x
2. Step 2: Convert to fraction form
   105.31/157.91 = 61.96/x
3. Step 3: Cross multiply
   105.31x = 157.91 × 61.96
4. Step 4: Simplify right side
   105.31x = 9,784.10
5. Step 5: Solve for x
   x = 9,784.10/105.31
6. Step 6: Final answer
   x = 92.91