Finding the Third Proportional to 312,195 and 671,820.75

Step by Step Solution

1. Step 1: Write the proportion equation
   312,195 : 671,820.75 = 671,820.75 : x
2. Step 2: Convert to fraction form
   312,195/671,820.75 = 671,820.75/x
3. Step 3: Cross multiply
   312,195x = 671,820.75 × 671,820.75
4. Step 4: Simplify right side
   312,195x = 451,343,120,130.56
5. Step 5: Solve for x
   x = 451,343,120,130.56/312,195
6. Step 6: Final answer
   x = 1,445,709.00