Finding the Third Proportional to 309,905 and 478,873.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,905 : 478,873.50 = 478,873.50 : x
2. Step 2: Convert to fraction form
   309,905/478,873.50 = 478,873.50/x
3. Step 3: Cross multiply
   309,905x = 478,873.50 × 478,873.50
4. Step 4: Simplify right side
   309,905x = 229,319,829,002.25
5. Step 5: Solve for x
   x = 229,319,829,002.25/309,905
6. Step 6: Final answer
   x = 739,968.15