Finding the Third Proportional to 139,455 and 304,830

Step by Step Solution

1. Step 1: Write the proportion equation
   139,455 : 304,830 = 304,830 : x
2. Step 2: Convert to fraction form
   139,455/304,830 = 304,830/x
3. Step 3: Cross multiply
   139,455x = 304,830 × 304,830
4. Step 4: Simplify right side
   139,455x = 92,921,328,900
5. Step 5: Solve for x
   x = 92,921,328,900/139,455
6. Step 6: Final answer
   x = 666,317.66