Finding the Third Proportional to 189,067.50 and 398,790

Step by Step Solution

1. Step 1: Write the proportion equation
   189,067.50 : 398,790 = 398,790 : x
2. Step 2: Convert to fraction form
   189,067.50/398,790 = 398,790/x
3. Step 3: Cross multiply
   189,067.50x = 398,790 × 398,790
4. Step 4: Simplify right side
   189,067.50x = 159,033,464,100
5. Step 5: Solve for x
   x = 159,033,464,100/189,067.50
6. Step 6: Final answer
   x = 841,146.49