Finding the Third Proportional to 12,439 and 19,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439 : 19,259.50 = 19,259.50 : x
2. Step 2: Convert to fraction form
   12,439/19,259.50 = 19,259.50/x
3. Step 3: Cross multiply
   12,439x = 19,259.50 × 19,259.50
4. Step 4: Simplify right side
   12,439x = 370,928,340.25
5. Step 5: Solve for x
   x = 370,928,340.25/12,439
6. Step 6: Final answer
   x = 29,819.79