Finding the Third Proportional to 312,144 and 671,632.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,144 : 671,632.50 = 671,632.50 : x
2. Step 2: Convert to fraction form
   312,144/671,632.50 = 671,632.50/x
3. Step 3: Cross multiply
   312,144x = 671,632.50 × 671,632.50
4. Step 4: Simplify right side
   312,144x = 451,090,215,056.25
5. Step 5: Solve for x
   x = 451,090,215,056.25/312,144
6. Step 6: Final answer
   x = 1,445,134.99