Finding the Third Proportional to 10,985.63 and 14,139.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,985.63 : 14,139.56 = 14,139.56 : x
2. Step 2: Convert to fraction form
   10,985.63/14,139.56 = 14,139.56/x
3. Step 3: Cross multiply
   10,985.63x = 14,139.56 × 14,139.56
4. Step 4: Simplify right side
   10,985.63x = 199,927,227.69
5. Step 5: Solve for x
   x = 199,927,227.69/10,985.63
6. Step 6: Final answer
   x = 18,198.99