Finding the Third Proportional to 387,394.50 and 839,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,394.50 : 839,131.50 = 839,131.50 : x
2. Step 2: Convert to fraction form
   387,394.50/839,131.50 = 839,131.50/x
3. Step 3: Cross multiply
   387,394.50x = 839,131.50 × 839,131.50
4. Step 4: Simplify right side
   387,394.50x = 704,141,674,292.25
5. Step 5: Solve for x
   x = 704,141,674,292.25/387,394.50
6. Step 6: Final answer
   x = 1,817,634.67