Finding the Third Proportional to 285,990 and 609,978

Step by Step Solution

1. Step 1: Write the proportion equation
   285,990 : 609,978 = 609,978 : x
2. Step 2: Convert to fraction form
   285,990/609,978 = 609,978/x
3. Step 3: Cross multiply
   285,990x = 609,978 × 609,978
4. Step 4: Simplify right side
   285,990x = 372,073,160,484
5. Step 5: Solve for x
   x = 372,073,160,484/285,990
6. Step 6: Final answer
   x = 1,301,000.60