Finding the Third Proportional to 13,005.56 and 16,691.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,005.56 : 16,691.06 = 16,691.06 : x
2. Step 2: Convert to fraction form
   13,005.56/16,691.06 = 16,691.06/x
3. Step 3: Cross multiply
   13,005.56x = 16,691.06 × 16,691.06
4. Step 4: Simplify right side
   13,005.56x = 278,591,567.38
5. Step 5: Solve for x
   x = 278,591,567.38/13,005.56
6. Step 6: Final answer
   x = 21,420.95