Finding the Third Proportional to 213,128 and 307,004

Step by Step Solution

1. Step 1: Write the proportion equation
   213,128 : 307,004 = 307,004 : x
2. Step 2: Convert to fraction form
   213,128/307,004 = 307,004/x
3. Step 3: Cross multiply
   213,128x = 307,004 × 307,004
4. Step 4: Simplify right side
   213,128x = 94,251,456,016
5. Step 5: Solve for x
   x = 94,251,456,016/213,128
6. Step 6: Final answer
   x = 442,229.35