Finding the Fourth Proportional to 103.52, 142.72 and 100.33

Step by Step Solution

1. Step 1: Write the proportion equation
   103.52 : 142.72 = 100.33 : x
2. Step 2: Convert to fraction form
   103.52/142.72 = 100.33/x
3. Step 3: Cross multiply
   103.52x = 142.72 × 100.33
4. Step 4: Simplify right side
   103.52x = 14,317.88
5. Step 5: Solve for x
   x = 14,317.88/103.52
6. Step 6: Final answer
   x = 138.31