Finding the Third Proportional to 999,436 and 2,185,280

Step by Step Solution

1. Step 1: Write the proportion equation
   999,436 : 2,185,280 = 2,185,280 : x
2. Step 2: Convert to fraction form
   999,436/2,185,280 = 2,185,280/x
3. Step 3: Cross multiply
   999,436x = 2,185,280 × 2,185,280
4. Step 4: Simplify right side
   999,436x = 4,775,448,678,400
5. Step 5: Solve for x
   x = 4,775,448,678,400/999,436
6. Step 6: Final answer
   x = 4,778,143.55