Finding the Third Proportional to 90,603 and 138,271.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,603 : 138,271.50 = 138,271.50 : x
2. Step 2: Convert to fraction form
   90,603/138,271.50 = 138,271.50/x
3. Step 3: Cross multiply
   90,603x = 138,271.50 × 138,271.50
4. Step 4: Simplify right side
   90,603x = 19,119,007,712.25
5. Step 5: Solve for x
   x = 19,119,007,712.25/90,603
6. Step 6: Final answer
   x = 211,019.59