Finding the Third Proportional to 187,440 and 404,405

Step by Step Solution

1. Step 1: Write the proportion equation
   187,440 : 404,405 = 404,405 : x
2. Step 2: Convert to fraction form
   187,440/404,405 = 404,405/x
3. Step 3: Cross multiply
   187,440x = 404,405 × 404,405
4. Step 4: Simplify right side
   187,440x = 163,543,404,025
5. Step 5: Solve for x
   x = 163,543,404,025/187,440
6. Step 6: Final answer
   x = 872,510.69