Finding the Fourth Proportional to 142.30, 196.37 and 100.35

Step by Step Solution

1. Step 1: Write the proportion equation
   142.30 : 196.37 = 100.35 : x
2. Step 2: Convert to fraction form
   142.30/196.37 = 100.35/x
3. Step 3: Cross multiply
   142.30x = 196.37 × 100.35
4. Step 4: Simplify right side
   142.30x = 19,705.73
5. Step 5: Solve for x
   x = 19,705.73/142.30
6. Step 6: Final answer
   x = 138.48