Finding the Fourth Proportional to 12,987.71, 19,478.76 and 4,103.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.71 : 19,478.76 = 4,103.73 : x
2. Step 2: Convert to fraction form
   12,987.71/19,478.76 = 4,103.73/x
3. Step 3: Cross multiply
   12,987.71x = 19,478.76 × 4,103.73
4. Step 4: Simplify right side
   12,987.71x = 79,935,571.77
5. Step 5: Solve for x
   x = 79,935,571.77/12,987.71
6. Step 6: Final answer
   x = 6,154.71