Finding the Fourth Proportional to 103.50, 142.83 and 64.69

Step by Step Solution

1. Step 1: Write the proportion equation
   103.50 : 142.83 = 64.69 : x
2. Step 2: Convert to fraction form
   103.50/142.83 = 64.69/x
3. Step 3: Cross multiply
   103.50x = 142.83 × 64.69
4. Step 4: Simplify right side
   103.50x = 9,239.32
5. Step 5: Solve for x
   x = 9,239.32/103.50
6. Step 6: Final answer
   x = 89.27