Finding the Third Proportional to 646,800 and 1,406,853

Step by Step Solution

1. Step 1: Write the proportion equation
   646,800 : 1,406,853 = 1,406,853 : x
2. Step 2: Convert to fraction form
   646,800/1,406,853 = 1,406,853/x
3. Step 3: Cross multiply
   646,800x = 1,406,853 × 1,406,853
4. Step 4: Simplify right side
   646,800x = 1,979,235,363,609
5. Step 5: Solve for x
   x = 1,979,235,363,609/646,800
6. Step 6: Final answer
   x = 3,060,042.31