Finding the Third Proportional to 11,789.30 and 12,780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.30 : 12,780.28 = 12,780.28 : x
2. Step 2: Convert to fraction form
   11,789.30/12,780.28 = 12,780.28/x
3. Step 3: Cross multiply
   11,789.30x = 12,780.28 × 12,780.28
4. Step 4: Simplify right side
   11,789.30x = 163,335,588.83
5. Step 5: Solve for x
   x = 163,335,588.83/11,789.30
6. Step 6: Final answer
   x = 13,854.57