Finding the Third Proportional to 308,979 and 413,836.50

Step by Step Solution

1. Step 1: Write the proportion equation
   308,979 : 413,836.50 = 413,836.50 : x
2. Step 2: Convert to fraction form
   308,979/413,836.50 = 413,836.50/x
3. Step 3: Cross multiply
   308,979x = 413,836.50 × 413,836.50
4. Step 4: Simplify right side
   308,979x = 171,260,648,732.25
5. Step 5: Solve for x
   x = 171,260,648,732.25/308,979
6. Step 6: Final answer
   x = 554,279.25