Finding the Third Proportional to 191,861 and 287,790

Step by Step Solution

1. Step 1: Write the proportion equation
   191,861 : 287,790 = 287,790 : x
2. Step 2: Convert to fraction form
   191,861/287,790 = 287,790/x
3. Step 3: Cross multiply
   191,861x = 287,790 × 287,790
4. Step 4: Simplify right side
   191,861x = 82,823,084,100
5. Step 5: Solve for x
   x = 82,823,084,100/191,861
6. Step 6: Final answer
   x = 431,682.75