Finding the Third Proportional to 12,139.88 and 16,200.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.88 : 16,200.84 = 16,200.84 : x
2. Step 2: Convert to fraction form
   12,139.88/16,200.84 = 16,200.84/x
3. Step 3: Cross multiply
   12,139.88x = 16,200.84 × 16,200.84
4. Step 4: Simplify right side
   12,139.88x = 262,467,338.21
5. Step 5: Solve for x
   x = 262,467,338.21/12,139.88
6. Step 6: Final answer
   x = 21,620.27