Finding the Third Proportional to 289,769.50 and 611,003

Step by Step Solution

1. Step 1: Write the proportion equation
   289,769.50 : 611,003 = 611,003 : x
2. Step 2: Convert to fraction form
   289,769.50/611,003 = 611,003/x
3. Step 3: Cross multiply
   289,769.50x = 611,003 × 611,003
4. Step 4: Simplify right side
   289,769.50x = 373,324,666,009
5. Step 5: Solve for x
   x = 373,324,666,009/289,769.50
6. Step 6: Final answer
   x = 1,288,350.45