Finding the Third Proportional to 305,370 and 438,367.50

Step by Step Solution

1. Step 1: Write the proportion equation
   305,370 : 438,367.50 = 438,367.50 : x
2. Step 2: Convert to fraction form
   305,370/438,367.50 = 438,367.50/x
3. Step 3: Cross multiply
   305,370x = 438,367.50 × 438,367.50
4. Step 4: Simplify right side
   305,370x = 192,166,065,056.25
5. Step 5: Solve for x
   x = 192,166,065,056.25/305,370
6. Step 6: Final answer
   x = 629,289.27