Finding the Third Proportional to 553,671 and 867,399.75

Step by Step Solution

1. Step 1: Write the proportion equation
   553,671 : 867,399.75 = 867,399.75 : x
2. Step 2: Convert to fraction form
   553,671/867,399.75 = 867,399.75/x
3. Step 3: Cross multiply
   553,671x = 867,399.75 × 867,399.75
4. Step 4: Simplify right side
   553,671x = 752,382,326,300.06
5. Step 5: Solve for x
   x = 752,382,326,300.06/553,671
6. Step 6: Final answer
   x = 1,358,897.84