Finding the Fourth Proportional to 16,890.86, 23,315.96 and 15,119.39

Step by Step Solution

1. Step 1: Write the proportion equation
   16,890.86 : 23,315.96 = 15,119.39 : x
2. Step 2: Convert to fraction form
   16,890.86/23,315.96 = 15,119.39/x
3. Step 3: Cross multiply
   16,890.86x = 23,315.96 × 15,119.39
4. Step 4: Simplify right side
   16,890.86x = 352,523,188.55
5. Step 5: Solve for x
   x = 352,523,188.55/16,890.86
6. Step 6: Final answer
   x = 20,870.64