Finding the Third Proportional to 245,622.38 and 390,582

Step by Step Solution

1. Step 1: Write the proportion equation
   245,622.38 : 390,582 = 390,582 : x
2. Step 2: Convert to fraction form
   245,622.38/390,582 = 390,582/x
3. Step 3: Cross multiply
   245,622.38x = 390,582 × 390,582
4. Step 4: Simplify right side
   245,622.38x = 152,554,298,724
5. Step 5: Solve for x
   x = 152,554,298,724/245,622.38
6. Step 6: Final answer
   x = 621,092.84