Finding the Third Proportional to 143,172 and 309,942

Step by Step Solution

1. Step 1: Write the proportion equation
   143,172 : 309,942 = 309,942 : x
2. Step 2: Convert to fraction form
   143,172/309,942 = 309,942/x
3. Step 3: Cross multiply
   143,172x = 309,942 × 309,942
4. Step 4: Simplify right side
   143,172x = 96,064,043,364
5. Step 5: Solve for x
   x = 96,064,043,364/143,172
6. Step 6: Final answer
   x = 670,969.49