Finding the Fourth Proportional to 31,723.56, 43,758.72 and 20,407.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,723.56 : 43,758.72 = 20,407.80 : x
2. Step 2: Convert to fraction form
   31,723.56/43,758.72 = 20,407.80/x
3. Step 3: Cross multiply
   31,723.56x = 43,758.72 × 20,407.80
4. Step 4: Simplify right side
   31,723.56x = 893,019,206.02
5. Step 5: Solve for x
   x = 893,019,206.02/31,723.56
6. Step 6: Final answer
   x = 28,150.03