Finding the Fourth Proportional to 21,788.16, 30,069.16 and 12,357.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,788.16 : 30,069.16 = 12,357.34 : x
2. Step 2: Convert to fraction form
   21,788.16/30,069.16 = 12,357.34/x
3. Step 3: Cross multiply
   21,788.16x = 30,069.16 × 12,357.34
4. Step 4: Simplify right side
   21,788.16x = 371,574,833.63
5. Step 5: Solve for x
   x = 371,574,833.63/21,788.16
6. Step 6: Final answer
   x = 17,053.98