Finding the Third Proportional to 309,881.25 and 478,836

Step by Step Solution

1. Step 1: Write the proportion equation
   309,881.25 : 478,836 = 478,836 : x
2. Step 2: Convert to fraction form
   309,881.25/478,836 = 478,836/x
3. Step 3: Cross multiply
   309,881.25x = 478,836 × 478,836
4. Step 4: Simplify right side
   309,881.25x = 229,283,914,896
5. Step 5: Solve for x
   x = 229,283,914,896/309,881.25
6. Step 6: Final answer
   x = 739,908.96