Finding the Third Proportional to 5,139.56 and 10,643.63

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.56 : 10,643.63 = 10,643.63 : x
2. Step 2: Convert to fraction form
   5,139.56/10,643.63 = 10,643.63/x
3. Step 3: Cross multiply
   5,139.56x = 10,643.63 × 10,643.63
4. Step 4: Simplify right side
   5,139.56x = 113,286,753.14
5. Step 5: Solve for x
   x = 113,286,753.14/5,139.56
6. Step 6: Final answer
   x = 22,042.10