Finding the Fourth Proportional to 14,947.72, 20,605.31 and 12,290.51

Step by Step Solution

1. Step 1: Write the proportion equation
   14,947.72 : 20,605.31 = 12,290.51 : x
2. Step 2: Convert to fraction form
   14,947.72/20,605.31 = 12,290.51/x
3. Step 3: Cross multiply
   14,947.72x = 20,605.31 × 12,290.51
4. Step 4: Simplify right side
   14,947.72x = 253,249,768.61
5. Step 5: Solve for x
   x = 253,249,768.61/14,947.72
6. Step 6: Final answer
   x = 16,942.37