Finding the Third Proportional to 238,426 and 521,138

Step by Step Solution

1. Step 1: Write the proportion equation
   238,426 : 521,138 = 521,138 : x
2. Step 2: Convert to fraction form
   238,426/521,138 = 521,138/x
3. Step 3: Cross multiply
   238,426x = 521,138 × 521,138
4. Step 4: Simplify right side
   238,426x = 271,584,815,044
5. Step 5: Solve for x
   x = 271,584,815,044/238,426
6. Step 6: Final answer
   x = 1,139,073.82