Finding the Fourth Proportional to 92.76, 127.89 and 78.99

Step by Step Solution

1. Step 1: Write the proportion equation
   92.76 : 127.89 = 78.99 : x
2. Step 2: Convert to fraction form
   92.76/127.89 = 78.99/x
3. Step 3: Cross multiply
   92.76x = 127.89 × 78.99
4. Step 4: Simplify right side
   92.76x = 10,102.03
5. Step 5: Solve for x
   x = 10,102.03/92.76
6. Step 6: Final answer
   x = 108.91