Finding the Fourth Proportional to 90.30, 123.72 and 88.14

Step by Step Solution

1. Step 1: Write the proportion equation
   90.30 : 123.72 = 88.14 : x
2. Step 2: Convert to fraction form
   90.30/123.72 = 88.14/x
3. Step 3: Cross multiply
   90.30x = 123.72 × 88.14
4. Step 4: Simplify right side
   90.30x = 10,904.68
5. Step 5: Solve for x
   x = 10,904.68/90.30
6. Step 6: Final answer
   x = 120.76