Finding the Third Proportional to 63,603 and 138,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   63,603 : 138,139.50 = 138,139.50 : x
2. Step 2: Convert to fraction form
   63,603/138,139.50 = 138,139.50/x
3. Step 3: Cross multiply
   63,603x = 138,139.50 × 138,139.50
4. Step 4: Simplify right side
   63,603x = 19,082,521,460.25
5. Step 5: Solve for x
   x = 19,082,521,460.25/63,603
6. Step 6: Final answer
   x = 300,025.49