Finding the Third Proportional to 312,043.50 and 684,945

Step by Step Solution

1. Step 1: Write the proportion equation
   312,043.50 : 684,945 = 684,945 : x
2. Step 2: Convert to fraction form
   312,043.50/684,945 = 684,945/x
3. Step 3: Cross multiply
   312,043.50x = 684,945 × 684,945
4. Step 4: Simplify right side
   312,043.50x = 469,149,653,025
5. Step 5: Solve for x
   x = 469,149,653,025/312,043.50
6. Step 6: Final answer
   x = 1,503,475.17