Finding the Third Proportional to 289,109.25 and 423,793.69

Step by Step Solution

1. Step 1: Write the proportion equation
   289,109.25 : 423,793.69 = 423,793.69 : x
2. Step 2: Convert to fraction form
   289,109.25/423,793.69 = 423,793.69/x
3. Step 3: Cross multiply
   289,109.25x = 423,793.69 × 423,793.69
4. Step 4: Simplify right side
   289,109.25x = 179,601,089,564.85
5. Step 5: Solve for x
   x = 179,601,089,564.85/289,109.25
6. Step 6: Final answer
   x = 621,222.22