Finding the Third Proportional to 138,603 and 300,516

Step by Step Solution

1. Step 1: Write the proportion equation
   138,603 : 300,516 = 300,516 : x
2. Step 2: Convert to fraction form
   138,603/300,516 = 300,516/x
3. Step 3: Cross multiply
   138,603x = 300,516 × 300,516
4. Step 4: Simplify right side
   138,603x = 90,309,866,256
5. Step 5: Solve for x
   x = 90,309,866,256/138,603
6. Step 6: Final answer
   x = 651,572.23