Finding the Third Proportional to 200,273.50 and 428,978

Step by Step Solution

1. Step 1: Write the proportion equation
   200,273.50 : 428,978 = 428,978 : x
2. Step 2: Convert to fraction form
   200,273.50/428,978 = 428,978/x
3. Step 3: Cross multiply
   200,273.50x = 428,978 × 428,978
4. Step 4: Simplify right side
   200,273.50x = 184,022,124,484
5. Step 5: Solve for x
   x = 184,022,124,484/200,273.50
6. Step 6: Final answer
   x = 918,854.09