Finding the Third Proportional to 165,856.50 and 389,889

Step by Step Solution

1. Step 1: Write the proportion equation
   165,856.50 : 389,889 = 389,889 : x
2. Step 2: Convert to fraction form
   165,856.50/389,889 = 389,889/x
3. Step 3: Cross multiply
   165,856.50x = 389,889 × 389,889
4. Step 4: Simplify right side
   165,856.50x = 152,013,432,321
5. Step 5: Solve for x
   x = 152,013,432,321/165,856.50
6. Step 6: Final answer
   x = 916,535.87