Finding the Third Proportional to 128,570.25 and 192,730.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,570.25 : 192,730.50 = 192,730.50 : x
2. Step 2: Convert to fraction form
   128,570.25/192,730.50 = 192,730.50/x
3. Step 3: Cross multiply
   128,570.25x = 192,730.50 × 192,730.50
4. Step 4: Simplify right side
   128,570.25x = 37,145,045,630.25
5. Step 5: Solve for x
   x = 37,145,045,630.25/128,570.25
6. Step 6: Final answer
   x = 288,908.56