Finding the Third Proportional to 178,956 and 389,876

Step by Step Solution

1. Step 1: Write the proportion equation
   178,956 : 389,876 = 389,876 : x
2. Step 2: Convert to fraction form
   178,956/389,876 = 389,876/x
3. Step 3: Cross multiply
   178,956x = 389,876 × 389,876
4. Step 4: Simplify right side
   178,956x = 152,003,295,376
5. Step 5: Solve for x
   x = 152,003,295,376/178,956
6. Step 6: Final answer
   x = 849,389.21