Finding the Third Proportional to 561,115 and 870,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,115 : 870,619.50 = 870,619.50 : x
2. Step 2: Convert to fraction form
   561,115/870,619.50 = 870,619.50/x
3. Step 3: Cross multiply
   561,115x = 870,619.50 × 870,619.50
4. Step 4: Simplify right side
   561,115x = 757,978,313,780.25
5. Step 5: Solve for x
   x = 757,978,313,780.25/561,115
6. Step 6: Final answer
   x = 1,350,843.08