Finding the Third Proportional to 168,624 and 390,384

Step by Step Solution

1. Step 1: Write the proportion equation
   168,624 : 390,384 = 390,384 : x
2. Step 2: Convert to fraction form
   168,624/390,384 = 390,384/x
3. Step 3: Cross multiply
   168,624x = 390,384 × 390,384
4. Step 4: Simplify right side
   168,624x = 152,399,667,456
5. Step 5: Solve for x
   x = 152,399,667,456/168,624
6. Step 6: Final answer
   x = 903,783.97