Finding the Third Proportional to 654,880 and 978,280

Step by Step Solution

1. Step 1: Write the proportion equation
   654,880 : 978,280 = 978,280 : x
2. Step 2: Convert to fraction form
   654,880/978,280 = 978,280/x
3. Step 3: Cross multiply
   654,880x = 978,280 × 978,280
4. Step 4: Simplify right side
   654,880x = 957,031,758,400
5. Step 5: Solve for x
   x = 957,031,758,400/654,880
6. Step 6: Final answer
   x = 1,461,384.92