Finding the Fourth Proportional to 103.22, 142.42 and 89.51

Step by Step Solution

1. Step 1: Write the proportion equation
   103.22 : 142.42 = 89.51 : x
2. Step 2: Convert to fraction form
   103.22/142.42 = 89.51/x
3. Step 3: Cross multiply
   103.22x = 142.42 × 89.51
4. Step 4: Simplify right side
   103.22x = 12,748.01
5. Step 5: Solve for x
   x = 12,748.01/103.22
6. Step 6: Final answer
   x = 123.50