Finding the Third Proportional to 615,516 and 1,389,078

Step by Step Solution

1. Step 1: Write the proportion equation
   615,516 : 1,389,078 = 1,389,078 : x
2. Step 2: Convert to fraction form
   615,516/1,389,078 = 1,389,078/x
3. Step 3: Cross multiply
   615,516x = 1,389,078 × 1,389,078
4. Step 4: Simplify right side
   615,516x = 1,929,537,690,084
5. Step 5: Solve for x
   x = 1,929,537,690,084/615,516
6. Step 6: Final answer
   x = 3,134,829.46