Finding the Third Proportional to 220,830 and 478,998

Step by Step Solution

1. Step 1: Write the proportion equation
   220,830 : 478,998 = 478,998 : x
2. Step 2: Convert to fraction form
   220,830/478,998 = 478,998/x
3. Step 3: Cross multiply
   220,830x = 478,998 × 478,998
4. Step 4: Simplify right side
   220,830x = 229,439,084,004
5. Step 5: Solve for x
   x = 229,439,084,004/220,830
6. Step 6: Final answer
   x = 1,038,985.12