Finding the Fourth Proportional to 21,819.51, 30,109.32 and 12,386.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.51 : 30,109.32 = 12,386.25 : x
2. Step 2: Convert to fraction form
   21,819.51/30,109.32 = 12,386.25/x
3. Step 3: Cross multiply
   21,819.51x = 30,109.32 × 12,386.25
4. Step 4: Simplify right side
   21,819.51x = 372,941,564.85
5. Step 5: Solve for x
   x = 372,941,564.85/21,819.51
6. Step 6: Final answer
   x = 17,092.11