Finding the Third Proportional to 307,300.50 and 665,145

Step by Step Solution

1. Step 1: Write the proportion equation
   307,300.50 : 665,145 = 665,145 : x
2. Step 2: Convert to fraction form
   307,300.50/665,145 = 665,145/x
3. Step 3: Cross multiply
   307,300.50x = 665,145 × 665,145
4. Step 4: Simplify right side
   307,300.50x = 442,417,871,025
5. Step 5: Solve for x
   x = 442,417,871,025/307,300.50
6. Step 6: Final answer
   x = 1,439,691.35