Finding the Third Proportional to 139,484 and 256,045

Step by Step Solution

1. Step 1: Write the proportion equation
   139,484 : 256,045 = 256,045 : x
2. Step 2: Convert to fraction form
   139,484/256,045 = 256,045/x
3. Step 3: Cross multiply
   139,484x = 256,045 × 256,045
4. Step 4: Simplify right side
   139,484x = 65,559,042,025
5. Step 5: Solve for x
   x = 65,559,042,025/139,484
6. Step 6: Final answer
   x = 470,011.20