Finding the Third Proportional to 13,820.63 and 20,800.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.63 : 20,800.55 = 20,800.55 : x
2. Step 2: Convert to fraction form
   13,820.63/20,800.55 = 20,800.55/x
3. Step 3: Cross multiply
   13,820.63x = 20,800.55 × 20,800.55
4. Step 4: Simplify right side
   13,820.63x = 432,662,750.30
5. Step 5: Solve for x
   x = 432,662,750.30/13,820.63
6. Step 6: Final answer
   x = 31,305.58