Finding the Third Proportional to 405,810 and 544,380.75

Step by Step Solution

1. Step 1: Write the proportion equation
   405,810 : 544,380.75 = 544,380.75 : x
2. Step 2: Convert to fraction form
   405,810/544,380.75 = 544,380.75/x
3. Step 3: Cross multiply
   405,810x = 544,380.75 × 544,380.75
4. Step 4: Simplify right side
   405,810x = 296,350,400,970.56
5. Step 5: Solve for x
   x = 296,350,400,970.56/405,810
6. Step 6: Final answer
   x = 730,268.85