Finding the Third Proportional to 858,297 and 1,298,490

Step by Step Solution

1. Step 1: Write the proportion equation
   858,297 : 1,298,490 = 1,298,490 : x
2. Step 2: Convert to fraction form
   858,297/1,298,490 = 1,298,490/x
3. Step 3: Cross multiply
   858,297x = 1,298,490 × 1,298,490
4. Step 4: Simplify right side
   858,297x = 1,686,076,280,100
5. Step 5: Solve for x
   x = 1,686,076,280,100/858,297
6. Step 6: Final answer
   x = 1,964,443.87