Finding the Third Proportional to 560,588 and 870,406

Step by Step Solution

1. Step 1: Write the proportion equation
   560,588 : 870,406 = 870,406 : x
2. Step 2: Convert to fraction form
   560,588/870,406 = 870,406/x
3. Step 3: Cross multiply
   560,588x = 870,406 × 870,406
4. Step 4: Simplify right side
   560,588x = 757,606,604,836
5. Step 5: Solve for x
   x = 757,606,604,836/560,588
6. Step 6: Final answer
   x = 1,351,449.91