Finding the Third Proportional to 616,374 and 978,009

Step by Step Solution

1. Step 1: Write the proportion equation
   616,374 : 978,009 = 978,009 : x
2. Step 2: Convert to fraction form
   616,374/978,009 = 978,009/x
3. Step 3: Cross multiply
   616,374x = 978,009 × 978,009
4. Step 4: Simplify right side
   616,374x = 956,501,604,081
5. Step 5: Solve for x
   x = 956,501,604,081/616,374
6. Step 6: Final answer
   x = 1,551,820.17