Finding the Fourth Proportional to 12,987.16, 19,494.51 and 10,551.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.16 : 19,494.51 = 10,551.39 : x
2. Step 2: Convert to fraction form
   12,987.16/19,494.51 = 10,551.39/x
3. Step 3: Cross multiply
   12,987.16x = 19,494.51 × 10,551.39
4. Step 4: Simplify right side
   12,987.16x = 205,694,144.33
5. Step 5: Solve for x
   x = 205,694,144.33/12,987.16
6. Step 6: Final answer
   x = 15,838.27