Finding the Fourth Proportional to 20,870.56, 31,309.94 and 7,723.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.56 : 31,309.94 = 7,723.05 : x
2. Step 2: Convert to fraction form
   20,870.56/31,309.94 = 7,723.05/x
3. Step 3: Cross multiply
   20,870.56x = 31,309.94 × 7,723.05
4. Step 4: Simplify right side
   20,870.56x = 241,808,134.01
5. Step 5: Solve for x
   x = 241,808,134.01/20,870.56
6. Step 6: Final answer
   x = 11,586.09