Finding the Fourth Proportional to 12,780.50, 19,171.58 and 4,015.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.50 : 19,171.58 = 4,015.76 : x
2. Step 2: Convert to fraction form
   12,780.50/19,171.58 = 4,015.76/x
3. Step 3: Cross multiply
   12,780.50x = 19,171.58 × 4,015.76
4. Step 4: Simplify right side
   12,780.50x = 76,988,348.16
5. Step 5: Solve for x
   x = 76,988,348.16/12,780.50
6. Step 6: Final answer
   x = 6,023.89