Finding the Third Proportional to 309,992.06 and 478,816.31

Step by Step Solution

1. Step 1: Write the proportion equation
   309,992.06 : 478,816.31 = 478,816.31 : x
2. Step 2: Convert to fraction form
   309,992.06/478,816.31 = 478,816.31/x
3. Step 3: Cross multiply
   309,992.06x = 478,816.31 × 478,816.31
4. Step 4: Simplify right side
   309,992.06x = 229,265,061,116.10
5. Step 5: Solve for x
   x = 229,265,061,116.10/309,992.06
6. Step 6: Final answer
   x = 739,583.65