Finding the Third Proportional to 200,128.50 and 304,321.50

Step by Step Solution

1. Step 1: Write the proportion equation
   200,128.50 : 304,321.50 = 304,321.50 : x
2. Step 2: Convert to fraction form
   200,128.50/304,321.50 = 304,321.50/x
3. Step 3: Cross multiply
   200,128.50x = 304,321.50 × 304,321.50
4. Step 4: Simplify right side
   200,128.50x = 92,611,575,362.25
5. Step 5: Solve for x
   x = 92,611,575,362.25/200,128.50
6. Step 6: Final answer
   x = 462,760.55