Finding the Third Proportional to 300,020 and 438,182

Step by Step Solution

1. Step 1: Write the proportion equation
   300,020 : 438,182 = 438,182 : x
2. Step 2: Convert to fraction form
   300,020/438,182 = 438,182/x
3. Step 3: Cross multiply
   300,020x = 438,182 × 438,182
4. Step 4: Simplify right side
   300,020x = 192,003,465,124
5. Step 5: Solve for x
   x = 192,003,465,124/300,020
6. Step 6: Final answer
   x = 639,968.89