Finding the Third Proportional to 305,128.50 and 443,841.75

Step by Step Solution

1. Step 1: Write the proportion equation
   305,128.50 : 443,841.75 = 443,841.75 : x
2. Step 2: Convert to fraction form
   305,128.50/443,841.75 = 443,841.75/x
3. Step 3: Cross multiply
   305,128.50x = 443,841.75 × 443,841.75
4. Step 4: Simplify right side
   305,128.50x = 196,995,499,043.06
5. Step 5: Solve for x
   x = 196,995,499,043.06/305,128.50
6. Step 6: Final answer
   x = 645,614.88