Finding the Third Proportional to 289,501.50 and 637,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   289,501.50 : 637,900.50 = 637,900.50 : x
2. Step 2: Convert to fraction form
   289,501.50/637,900.50 = 637,900.50/x
3. Step 3: Cross multiply
   289,501.50x = 637,900.50 × 637,900.50
4. Step 4: Simplify right side
   289,501.50x = 406,917,047,900.25
5. Step 5: Solve for x
   x = 406,917,047,900.25/289,501.50
6. Step 6: Final answer
   x = 1,405,578.37