Finding the Third Proportional to 243,179 and 388,484

Step by Step Solution

1. Step 1: Write the proportion equation
   243,179 : 388,484 = 388,484 : x
2. Step 2: Convert to fraction form
   243,179/388,484 = 388,484/x
3. Step 3: Cross multiply
   243,179x = 388,484 × 388,484
4. Step 4: Simplify right side
   243,179x = 150,919,818,256
5. Step 5: Solve for x
   x = 150,919,818,256/243,179
6. Step 6: Final answer
   x = 620,612.05