Finding the Fourth Proportional to 90.36, 123.89 and 88.07

Step by Step Solution

1. Step 1: Write the proportion equation
   90.36 : 123.89 = 88.07 : x
2. Step 2: Convert to fraction form
   90.36/123.89 = 88.07/x
3. Step 3: Cross multiply
   90.36x = 123.89 × 88.07
4. Step 4: Simplify right side
   90.36x = 10,909.93
5. Step 5: Solve for x
   x = 10,909.93/90.36
6. Step 6: Final answer
   x = 120.74