Finding the Third Proportional to 4,779.56 and 10,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   4,779.56 : 10,139.06 = 10,139.06 : x
2. Step 2: Convert to fraction form
   4,779.56/10,139.06 = 10,139.06/x
3. Step 3: Cross multiply
   4,779.56x = 10,139.06 × 10,139.06
4. Step 4: Simplify right side
   4,779.56x = 102,800,588.38
5. Step 5: Solve for x
   x = 102,800,588.38/4,779.56
6. Step 6: Final answer
   x = 21,508.37