Finding the Third Proportional to 10,909.69 and 17,139.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,909.69 : 17,139.09 = 17,139.09 : x
2. Step 2: Convert to fraction form
   10,909.69/17,139.09 = 17,139.09/x
3. Step 3: Cross multiply
   10,909.69x = 17,139.09 × 17,139.09
4. Step 4: Simplify right side
   10,909.69x = 293,748,534.57
5. Step 5: Solve for x
   x = 293,748,534.57/10,909.69
6. Step 6: Final answer
   x = 26,925.48