Finding the Third Proportional to 285,058.50 and 619,401

Step by Step Solution

1. Step 1: Write the proportion equation
   285,058.50 : 619,401 = 619,401 : x
2. Step 2: Convert to fraction form
   285,058.50/619,401 = 619,401/x
3. Step 3: Cross multiply
   285,058.50x = 619,401 × 619,401
4. Step 4: Simplify right side
   285,058.50x = 383,657,598,801
5. Step 5: Solve for x
   x = 383,657,598,801/285,058.50
6. Step 6: Final answer
   x = 1,345,890.75