Finding the Fourth Proportional to 90.06, 123.28 and 87.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90.06 : 123.28 = 87.30 : x
2. Step 2: Convert to fraction form
   90.06/123.28 = 87.30/x
3. Step 3: Cross multiply
   90.06x = 123.28 × 87.30
4. Step 4: Simplify right side
   90.06x = 10,762.34
5. Step 5: Solve for x
   x = 10,762.34/90.06
6. Step 6: Final answer
   x = 119.50