Finding the Fourth Proportional to 90.02, 124.18 and 86.53

Step by Step Solution

1. Step 1: Write the proportion equation
   90.02 : 124.18 = 86.53 : x
2. Step 2: Convert to fraction form
   90.02/124.18 = 86.53/x
3. Step 3: Cross multiply
   90.02x = 124.18 × 86.53
4. Step 4: Simplify right side
   90.02x = 10,745.32
5. Step 5: Solve for x
   x = 10,745.32/90.02
6. Step 6: Final answer
   x = 119.37