Finding the Third Proportional to 839,128.36 and 1,290,548.32

Step by Step Solution

1. Step 1: Write the proportion equation
   839,128.36 : 1,290,548.32 = 1,290,548.32 : x
2. Step 2: Convert to fraction form
   839,128.36/1,290,548.32 = 1,290,548.32/x
3. Step 3: Cross multiply
   839,128.36x = 1,290,548.32 × 1,290,548.32
4. Step 4: Simplify right side
   839,128.36x = 1,665,514,967,061.42
5. Step 5: Solve for x
   x = 1,665,514,967,061.42/839,128.36
6. Step 6: Final answer
   x = 1,984,815.49