Finding the Third Proportional to 312,079.50 and 677,058

Step by Step Solution

1. Step 1: Write the proportion equation
   312,079.50 : 677,058 = 677,058 : x
2. Step 2: Convert to fraction form
   312,079.50/677,058 = 677,058/x
3. Step 3: Cross multiply
   312,079.50x = 677,058 × 677,058
4. Step 4: Simplify right side
   312,079.50x = 458,407,535,364
5. Step 5: Solve for x
   x = 458,407,535,364/312,079.50
6. Step 6: Final answer
   x = 1,468,880.64