Finding the Fourth Proportional to 21,789.12, 30,068.10 and 12,357.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.12 : 30,068.10 = 12,357.48 : x
2. Step 2: Convert to fraction form
   21,789.12/30,068.10 = 12,357.48/x
3. Step 3: Cross multiply
   21,789.12x = 30,068.10 × 12,357.48
4. Step 4: Simplify right side
   21,789.12x = 371,565,944.39
5. Step 5: Solve for x
   x = 371,565,944.39/21,789.12
6. Step 6: Final answer
   x = 17,052.82