Finding the Third Proportional to 20,405.81 and 28,899.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,405.81 : 28,899.56 = 28,899.56 : x
2. Step 2: Convert to fraction form
   20,405.81/28,899.56 = 28,899.56/x
3. Step 3: Cross multiply
   20,405.81x = 28,899.56 × 28,899.56
4. Step 4: Simplify right side
   20,405.81x = 835,184,712.69
5. Step 5: Solve for x
   x = 835,184,712.69/20,405.81
6. Step 6: Final answer
   x = 40,928.77