Finding the Fourth Proportional to 21,788.20, 30,068.14 and 12,356.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,788.20 : 30,068.14 = 12,356.60 : x
2. Step 2: Convert to fraction form
   21,788.20/30,068.14 = 12,356.60/x
3. Step 3: Cross multiply
   21,788.20x = 30,068.14 × 12,356.60
4. Step 4: Simplify right side
   21,788.20x = 371,539,978.72
5. Step 5: Solve for x
   x = 371,539,978.72/21,788.20
6. Step 6: Final answer
   x = 17,052.35