Finding the Third Proportional to 131,808 and 289,856

Step by Step Solution

1. Step 1: Write the proportion equation
   131,808 : 289,856 = 289,856 : x
2. Step 2: Convert to fraction form
   131,808/289,856 = 289,856/x
3. Step 3: Cross multiply
   131,808x = 289,856 × 289,856
4. Step 4: Simplify right side
   131,808x = 84,016,500,736
5. Step 5: Solve for x
   x = 84,016,500,736/131,808
6. Step 6: Final answer
   x = 637,415.79