Finding the Third Proportional to 405,580 and 880,280

Step by Step Solution

1. Step 1: Write the proportion equation
   405,580 : 880,280 = 880,280 : x
2. Step 2: Convert to fraction form
   405,580/880,280 = 880,280/x
3. Step 3: Cross multiply
   405,580x = 880,280 × 880,280
4. Step 4: Simplify right side
   405,580x = 774,892,878,400
5. Step 5: Solve for x
   x = 774,892,878,400/405,580
6. Step 6: Final answer
   x = 1,910,579.61