Finding the Fourth Proportional to 31,722.27, 43,756.91 and 20,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,722.27 : 43,756.91 = 20,406.50 : x
2. Step 2: Convert to fraction form
   31,722.27/43,756.91 = 20,406.50/x
3. Step 3: Cross multiply
   31,722.27x = 43,756.91 × 20,406.50
4. Step 4: Simplify right side
   31,722.27x = 892,925,303.71
5. Step 5: Solve for x
   x = 892,925,303.71/31,722.27
6. Step 6: Final answer
   x = 28,148.22