Finding the Third Proportional to 307,900 and 490,310.50

Step by Step Solution

1. Step 1: Write the proportion equation
   307,900 : 490,310.50 = 490,310.50 : x
2. Step 2: Convert to fraction form
   307,900/490,310.50 = 490,310.50/x
3. Step 3: Cross multiply
   307,900x = 490,310.50 × 490,310.50
4. Step 4: Simplify right side
   307,900x = 240,404,386,410.25
5. Step 5: Solve for x
   x = 240,404,386,410.25/307,900
6. Step 6: Final answer
   x = 780,787.22