Finding the Third Proportional to 453,686 and 978,240

Step by Step Solution

1. Step 1: Write the proportion equation
   453,686 : 978,240 = 978,240 : x
2. Step 2: Convert to fraction form
   453,686/978,240 = 978,240/x
3. Step 3: Cross multiply
   453,686x = 978,240 × 978,240
4. Step 4: Simplify right side
   453,686x = 956,953,497,600
5. Step 5: Solve for x
   x = 956,953,497,600/453,686
6. Step 6: Final answer
   x = 2,109,285.93