Finding the Fourth Proportional to 31,431.72, 47,144.72 and 18,867.36

Step by Step Solution

1. Step 1: Write the proportion equation
   31,431.72 : 47,144.72 = 18,867.36 : x
2. Step 2: Convert to fraction form
   31,431.72/47,144.72 = 18,867.36/x
3. Step 3: Cross multiply
   31,431.72x = 47,144.72 × 18,867.36
4. Step 4: Simplify right side
   31,431.72x = 889,496,404.34
5. Step 5: Solve for x
   x = 889,496,404.34/31,431.72
6. Step 6: Final answer
   x = 28,299.32