Finding the Third Proportional to 99,144 and 141,912

Step by Step Solution

1. Step 1: Write the proportion equation
   99,144 : 141,912 = 141,912 : x
2. Step 2: Convert to fraction form
   99,144/141,912 = 141,912/x
3. Step 3: Cross multiply
   99,144x = 141,912 × 141,912
4. Step 4: Simplify right side
   99,144x = 20,139,015,744
5. Step 5: Solve for x
   x = 20,139,015,744/99,144
6. Step 6: Final answer
   x = 203,128.94