Finding the Third Proportional to 178,516.50 and 389,634

Step by Step Solution

1. Step 1: Write the proportion equation
   178,516.50 : 389,634 = 389,634 : x
2. Step 2: Convert to fraction form
   178,516.50/389,634 = 389,634/x
3. Step 3: Cross multiply
   178,516.50x = 389,634 × 389,634
4. Step 4: Simplify right side
   178,516.50x = 151,814,653,956
5. Step 5: Solve for x
   x = 151,814,653,956/178,516.50
6. Step 6: Final answer
   x = 850,423.65