Finding the Third Proportional to 7,826.63 and 12,120.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,826.63 : 12,120.89 = 12,120.89 : x
2. Step 2: Convert to fraction form
   7,826.63/12,120.89 = 12,120.89/x
3. Step 3: Cross multiply
   7,826.63x = 12,120.89 × 12,120.89
4. Step 4: Simplify right side
   7,826.63x = 146,915,989.54
5. Step 5: Solve for x
   x = 146,915,989.54/7,826.63
6. Step 6: Final answer
   x = 18,771.31