Finding the Third Proportional to 143,194 and 309,988

Step by Step Solution

1. Step 1: Write the proportion equation
   143,194 : 309,988 = 309,988 : x
2. Step 2: Convert to fraction form
   143,194/309,988 = 309,988/x
3. Step 3: Cross multiply
   143,194x = 309,988 × 309,988
4. Step 4: Simplify right side
   143,194x = 96,092,560,144
5. Step 5: Solve for x
   x = 96,092,560,144/143,194
6. Step 6: Final answer
   x = 671,065.55