Finding the Third Proportional to 323,808.75 and 687,078

Step by Step Solution

1. Step 1: Write the proportion equation
   323,808.75 : 687,078 = 687,078 : x
2. Step 2: Convert to fraction form
   323,808.75/687,078 = 687,078/x
3. Step 3: Cross multiply
   323,808.75x = 687,078 × 687,078
4. Step 4: Simplify right side
   323,808.75x = 472,076,178,084
5. Step 5: Solve for x
   x = 472,076,178,084/323,808.75
6. Step 6: Final answer
   x = 1,457,885.80