Finding the Fourth Proportional to 21,788.76, 30,068.12 and 12,228.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,788.76 : 30,068.12 = 12,228.87 : x
2. Step 2: Convert to fraction form
   21,788.76/30,068.12 = 12,228.87/x
3. Step 3: Cross multiply
   21,788.76x = 30,068.12 × 12,228.87
4. Step 4: Simplify right side
   21,788.76x = 367,699,069.48
5. Step 5: Solve for x
   x = 367,699,069.48/21,788.76
6. Step 6: Final answer
   x = 16,875.63