Finding the Fourth Proportional to 21,789.07, 30,068.92 and 12,357.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.07 : 30,068.92 = 12,357.63 : x
2. Step 2: Convert to fraction form
   21,789.07/30,068.92 = 12,357.63/x
3. Step 3: Cross multiply
   21,789.07x = 30,068.92 × 12,357.63
4. Step 4: Simplify right side
   21,789.07x = 371,580,603.31
5. Step 5: Solve for x
   x = 371,580,603.31/21,789.07
6. Step 6: Final answer
   x = 17,053.53