Finding the Fourth Proportional to 90.29, 124.56 and 64.10

Step by Step Solution

1. Step 1: Write the proportion equation
   90.29 : 124.56 = 64.10 : x
2. Step 2: Convert to fraction form
   90.29/124.56 = 64.10/x
3. Step 3: Cross multiply
   90.29x = 124.56 × 64.10
4. Step 4: Simplify right side
   90.29x = 7,984.30
5. Step 5: Solve for x
   x = 7,984.30/90.29
6. Step 6: Final answer
   x = 88.43