Finding the Fourth Proportional to 21,746.88, 30,009.69 and 12,315.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,746.88 : 30,009.69 = 12,315.51 : x
2. Step 2: Convert to fraction form
   21,746.88/30,009.69 = 12,315.51/x
3. Step 3: Cross multiply
   21,746.88x = 30,009.69 × 12,315.51
4. Step 4: Simplify right side
   21,746.88x = 369,584,637.29
5. Step 5: Solve for x
   x = 369,584,637.29/21,746.88
6. Step 6: Final answer
   x = 16,994.83