Finding the Third Proportional to 815,580 and 1,688,508

Step by Step Solution

1. Step 1: Write the proportion equation
   815,580 : 1,688,508 = 1,688,508 : x
2. Step 2: Convert to fraction form
   815,580/1,688,508 = 1,688,508/x
3. Step 3: Cross multiply
   815,580x = 1,688,508 × 1,688,508
4. Step 4: Simplify right side
   815,580x = 2,851,059,266,064
5. Step 5: Solve for x
   x = 2,851,059,266,064/815,580
6. Step 6: Final answer
   x = 3,495,744.46