Finding the Third Proportional to 139,319 and 215,254.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,319 : 215,254.50 = 215,254.50 : x
2. Step 2: Convert to fraction form
   139,319/215,254.50 = 215,254.50/x
3. Step 3: Cross multiply
   139,319x = 215,254.50 × 215,254.50
4. Step 4: Simplify right side
   139,319x = 46,334,499,770.25
5. Step 5: Solve for x
   x = 46,334,499,770.25/139,319
6. Step 6: Final answer
   x = 332,578.47