Finding the Third Proportional to 128,604 and 282,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,604 : 282,109.50 = 282,109.50 : x
2. Step 2: Convert to fraction form
   128,604/282,109.50 = 282,109.50/x
3. Step 3: Cross multiply
   128,604x = 282,109.50 × 282,109.50
4. Step 4: Simplify right side
   128,604x = 79,585,769,990.25
5. Step 5: Solve for x
   x = 79,585,769,990.25/128,604
6. Step 6: Final answer
   x = 618,843.66