Finding the Fourth Proportional to 31,173.54, 43,005.78 and 18,591

Step by Step Solution

1. Step 1: Write the proportion equation
   31,173.54 : 43,005.78 = 18,591 : x
2. Step 2: Convert to fraction form
   31,173.54/43,005.78 = 18,591/x
3. Step 3: Cross multiply
   31,173.54x = 43,005.78 × 18,591
4. Step 4: Simplify right side
   31,173.54x = 799,520,455.98
5. Step 5: Solve for x
   x = 799,520,455.98/31,173.54
6. Step 6: Final answer
   x = 25,647.41