Finding the Third Proportional to 335,716.50 and 686,940

Step by Step Solution

1. Step 1: Write the proportion equation
   335,716.50 : 686,940 = 686,940 : x
2. Step 2: Convert to fraction form
   335,716.50/686,940 = 686,940/x
3. Step 3: Cross multiply
   335,716.50x = 686,940 × 686,940
4. Step 4: Simplify right side
   335,716.50x = 471,886,563,600
5. Step 5: Solve for x
   x = 471,886,563,600/335,716.50
6. Step 6: Final answer
   x = 1,405,610.28