Finding the Third Proportional to 307,311 and 665,164.50

Step by Step Solution

1. Step 1: Write the proportion equation
   307,311 : 665,164.50 = 665,164.50 : x
2. Step 2: Convert to fraction form
   307,311/665,164.50 = 665,164.50/x
3. Step 3: Cross multiply
   307,311x = 665,164.50 × 665,164.50
4. Step 4: Simplify right side
   307,311x = 442,443,812,060.25
5. Step 5: Solve for x
   x = 442,443,812,060.25/307,311
6. Step 6: Final answer
   x = 1,439,726.57