Finding the Third Proportional to 204,129 and 409,079.25

Step by Step Solution

1. Step 1: Write the proportion equation
   204,129 : 409,079.25 = 409,079.25 : x
2. Step 2: Convert to fraction form
   204,129/409,079.25 = 409,079.25/x
3. Step 3: Cross multiply
   204,129x = 409,079.25 × 409,079.25
4. Step 4: Simplify right side
   204,129x = 167,345,832,780.56
5. Step 5: Solve for x
   x = 167,345,832,780.56/204,129
6. Step 6: Final answer
   x = 819,804.30