Finding the Third Proportional to 139,464 and 213,390

Step by Step Solution

1. Step 1: Write the proportion equation
   139,464 : 213,390 = 213,390 : x
2. Step 2: Convert to fraction form
   139,464/213,390 = 213,390/x
3. Step 3: Cross multiply
   139,464x = 213,390 × 213,390
4. Step 4: Simplify right side
   139,464x = 45,535,292,100
5. Step 5: Solve for x
   x = 45,535,292,100/139,464
6. Step 6: Final answer
   x = 326,502.12