Finding the Third Proportional to 280,690.50 and 309,805.50

Step by Step Solution

1. Step 1: Write the proportion equation
   280,690.50 : 309,805.50 = 309,805.50 : x
2. Step 2: Convert to fraction form
   280,690.50/309,805.50 = 309,805.50/x
3. Step 3: Cross multiply
   280,690.50x = 309,805.50 × 309,805.50
4. Step 4: Simplify right side
   280,690.50x = 95,979,447,830.25
5. Step 5: Solve for x
   x = 95,979,447,830.25/280,690.50
6. Step 6: Final answer
   x = 341,940.49