Finding the Fourth Proportional to 92.10, 126.82 and 78.96

Step by Step Solution

1. Step 1: Write the proportion equation
   92.10 : 126.82 = 78.96 : x
2. Step 2: Convert to fraction form
   92.10/126.82 = 78.96/x
3. Step 3: Cross multiply
   92.10x = 126.82 × 78.96
4. Step 4: Simplify right side
   92.10x = 10,013.71
5. Step 5: Solve for x
   x = 10,013.71/92.10
6. Step 6: Final answer
   x = 108.73