Finding the Fourth Proportional to 92.76, 128.06 and 85.83

Step by Step Solution

1. Step 1: Write the proportion equation
   92.76 : 128.06 = 85.83 : x
2. Step 2: Convert to fraction form
   92.76/128.06 = 85.83/x
3. Step 3: Cross multiply
   92.76x = 128.06 × 85.83
4. Step 4: Simplify right side
   92.76x = 10,991.39
5. Step 5: Solve for x
   x = 10,991.39/92.76
6. Step 6: Final answer
   x = 118.49