Finding the Third Proportional to 138,447 and 212,692.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,447 : 212,692.50 = 212,692.50 : x
2. Step 2: Convert to fraction form
   138,447/212,692.50 = 212,692.50/x
3. Step 3: Cross multiply
   138,447x = 212,692.50 × 212,692.50
4. Step 4: Simplify right side
   138,447x = 45,238,099,556.25
5. Step 5: Solve for x
   x = 45,238,099,556.25/138,447
6. Step 6: Final answer
   x = 326,753.92