Finding the Fourth Proportional to 16,971.30, 25,430.94 and 8,638.83

Step by Step Solution

1. Step 1: Write the proportion equation
   16,971.30 : 25,430.94 = 8,638.83 : x
2. Step 2: Convert to fraction form
   16,971.30/25,430.94 = 8,638.83/x
3. Step 3: Cross multiply
   16,971.30x = 25,430.94 × 8,638.83
4. Step 4: Simplify right side
   16,971.30x = 219,693,567.40
5. Step 5: Solve for x
   x = 219,693,567.40/16,971.30
6. Step 6: Final answer
   x = 12,945.01