Finding the Third Proportional to 142,034 and 309,490

Step by Step Solution

1. Step 1: Write the proportion equation
   142,034 : 309,490 = 309,490 : x
2. Step 2: Convert to fraction form
   142,034/309,490 = 309,490/x
3. Step 3: Cross multiply
   142,034x = 309,490 × 309,490
4. Step 4: Simplify right side
   142,034x = 95,784,060,100
5. Step 5: Solve for x
   x = 95,784,060,100/142,034
6. Step 6: Final answer
   x = 674,374.16