Finding the Third Proportional to 129,600 and 200,142

Step by Step Solution

1. Step 1: Write the proportion equation
   129,600 : 200,142 = 200,142 : x
2. Step 2: Convert to fraction form
   129,600/200,142 = 200,142/x
3. Step 3: Cross multiply
   129,600x = 200,142 × 200,142
4. Step 4: Simplify right side
   129,600x = 40,056,820,164
5. Step 5: Solve for x
   x = 40,056,820,164/129,600
6. Step 6: Final answer
   x = 309,080.40