Finding the Fourth Proportional to 21,788.86, 30,066.87 and 12,358.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,788.86 : 30,066.87 = 12,358.30 : x
2. Step 2: Convert to fraction form
   21,788.86/30,066.87 = 12,358.30/x
3. Step 3: Cross multiply
   21,788.86x = 30,066.87 × 12,358.30
4. Step 4: Simplify right side
   21,788.86x = 371,575,399.52
5. Step 5: Solve for x
   x = 371,575,399.52/21,788.86
6. Step 6: Final answer
   x = 17,053.46