Finding the Third Proportional to 6,439.50 and 12,172.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,439.50 : 12,172.78 = 12,172.78 : x
2. Step 2: Convert to fraction form
   6,439.50/12,172.78 = 12,172.78/x
3. Step 3: Cross multiply
   6,439.50x = 12,172.78 × 12,172.78
4. Step 4: Simplify right side
   6,439.50x = 148,176,603.36
5. Step 5: Solve for x
   x = 148,176,603.36/6,439.50
6. Step 6: Final answer
   x = 23,010.58