Finding the Fourth Proportional to 31,647.72, 43,655.58 and 20,469.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,647.72 : 43,655.58 = 20,469.72 : x
2. Step 2: Convert to fraction form
   31,647.72/43,655.58 = 20,469.72/x
3. Step 3: Cross multiply
   31,647.72x = 43,655.58 × 20,469.72
4. Step 4: Simplify right side
   31,647.72x = 893,617,499.04
5. Step 5: Solve for x
   x = 893,617,499.04/31,647.72
6. Step 6: Final answer
   x = 28,236.39