Finding the Third Proportional to 561,115.25 and 870,620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,115.25 : 870,620.50 = 870,620.50 : x
2. Step 2: Convert to fraction form
   561,115.25/870,620.50 = 870,620.50/x
3. Step 3: Cross multiply
   561,115.25x = 870,620.50 × 870,620.50
4. Step 4: Simplify right side
   561,115.25x = 757,980,055,020.25
5. Step 5: Solve for x
   x = 757,980,055,020.25/561,115.25
6. Step 6: Final answer
   x = 1,350,845.58