Finding the Third Proportional to 615,886 and 978,078

Step by Step Solution

1. Step 1: Write the proportion equation
   615,886 : 978,078 = 978,078 : x
2. Step 2: Convert to fraction form
   615,886/978,078 = 978,078/x
3. Step 3: Cross multiply
   615,886x = 978,078 × 978,078
4. Step 4: Simplify right side
   615,886x = 956,636,574,084
5. Step 5: Solve for x
   x = 956,636,574,084/615,886
6. Step 6: Final answer
   x = 1,553,268.91