Finding the Third Proportional to 309,159 and 671,192.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,159 : 671,192.50 = 671,192.50 : x
2. Step 2: Convert to fraction form
   309,159/671,192.50 = 671,192.50/x
3. Step 3: Cross multiply
   309,159x = 671,192.50 × 671,192.50
4. Step 4: Simplify right side
   309,159x = 450,499,372,056.25
5. Step 5: Solve for x
   x = 450,499,372,056.25/309,159
6. Step 6: Final answer
   x = 1,457,176.96