Finding the Fourth Proportional to 142.16, 196.15 and 100.69

Step by Step Solution

1. Step 1: Write the proportion equation
   142.16 : 196.15 = 100.69 : x
2. Step 2: Convert to fraction form
   142.16/196.15 = 100.69/x
3. Step 3: Cross multiply
   142.16x = 196.15 × 100.69
4. Step 4: Simplify right side
   142.16x = 19,750.61
5. Step 5: Solve for x
   x = 19,750.61/142.16
6. Step 6: Final answer
   x = 138.94