Finding the Third Proportional to 291,708.50 and 637,405

Step by Step Solution

1. Step 1: Write the proportion equation
   291,708.50 : 637,405 = 637,405 : x
2. Step 2: Convert to fraction form
   291,708.50/637,405 = 637,405/x
3. Step 3: Cross multiply
   291,708.50x = 637,405 × 637,405
4. Step 4: Simplify right side
   291,708.50x = 406,285,134,025
5. Step 5: Solve for x
   x = 406,285,134,025/291,708.50
6. Step 6: Final answer
   x = 1,392,777.84