Finding the Fourth Proportional to 90.09, 134.52 and 77.27

Step by Step Solution

1. Step 1: Write the proportion equation
   90.09 : 134.52 = 77.27 : x
2. Step 2: Convert to fraction form
   90.09/134.52 = 77.27/x
3. Step 3: Cross multiply
   90.09x = 134.52 × 77.27
4. Step 4: Simplify right side
   90.09x = 10,393.69
5. Step 5: Solve for x
   x = 10,393.69/90.09
6. Step 6: Final answer
   x = 115.37