Finding the Third Proportional to 238,972 and 521,422

Step by Step Solution

1. Step 1: Write the proportion equation
   238,972 : 521,422 = 521,422 : x
2. Step 2: Convert to fraction form
   238,972/521,422 = 521,422/x
3. Step 3: Cross multiply
   238,972x = 521,422 × 521,422
4. Step 4: Simplify right side
   238,972x = 271,880,902,084
5. Step 5: Solve for x
   x = 271,880,902,084/238,972
6. Step 6: Final answer
   x = 1,137,710.28