Finding the Third Proportional to 686,990 and 1,465,280

Step by Step Solution

1. Step 1: Write the proportion equation
   686,990 : 1,465,280 = 1,465,280 : x
2. Step 2: Convert to fraction form
   686,990/1,465,280 = 1,465,280/x
3. Step 3: Cross multiply
   686,990x = 1,465,280 × 1,465,280
4. Step 4: Simplify right side
   686,990x = 2,147,045,478,400
5. Step 5: Solve for x
   x = 2,147,045,478,400/686,990
6. Step 6: Final answer
   x = 3,125,293.64