Finding the Third Proportional to 156,678 and 335,490

Step by Step Solution

1. Step 1: Write the proportion equation
   156,678 : 335,490 = 335,490 : x
2. Step 2: Convert to fraction form
   156,678/335,490 = 335,490/x
3. Step 3: Cross multiply
   156,678x = 335,490 × 335,490
4. Step 4: Simplify right side
   156,678x = 112,553,540,100
5. Step 5: Solve for x
   x = 112,553,540,100/156,678
6. Step 6: Final answer
   x = 718,374.88