Finding the Third Proportional to 686,870 and 1,475,308

Step by Step Solution

1. Step 1: Write the proportion equation
   686,870 : 1,475,308 = 1,475,308 : x
2. Step 2: Convert to fraction form
   686,870/1,475,308 = 1,475,308/x
3. Step 3: Cross multiply
   686,870x = 1,475,308 × 1,475,308
4. Step 4: Simplify right side
   686,870x = 2,176,533,694,864
5. Step 5: Solve for x
   x = 2,176,533,694,864/686,870
6. Step 6: Final answer
   x = 3,168,770.94