Finding the Third Proportional to 9,129 and 19,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,129 : 19,819.50 = 19,819.50 : x
2. Step 2: Convert to fraction form
   9,129/19,819.50 = 19,819.50/x
3. Step 3: Cross multiply
   9,129x = 19,819.50 × 19,819.50
4. Step 4: Simplify right side
   9,129x = 392,812,580.25
5. Step 5: Solve for x
   x = 392,812,580.25/9,129
6. Step 6: Final answer
   x = 43,029.09