Finding the Third Proportional to 309,147 and 651,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,147 : 651,505.50 = 651,505.50 : x
2. Step 2: Convert to fraction form
   309,147/651,505.50 = 651,505.50/x
3. Step 3: Cross multiply
   309,147x = 651,505.50 × 651,505.50
4. Step 4: Simplify right side
   309,147x = 424,459,416,530.25
5. Step 5: Solve for x
   x = 424,459,416,530.25/309,147
6. Step 6: Final answer
   x = 1,373,001.89