Finding the Third Proportional to 141,172 and 309,980

Step by Step Solution

1. Step 1: Write the proportion equation
   141,172 : 309,980 = 309,980 : x
2. Step 2: Convert to fraction form
   141,172/309,980 = 309,980/x
3. Step 3: Cross multiply
   141,172x = 309,980 × 309,980
4. Step 4: Simplify right side
   141,172x = 96,087,600,400
5. Step 5: Solve for x
   x = 96,087,600,400/141,172
6. Step 6: Final answer
   x = 680,642.06