Finding the Fourth Proportional to 12,498.50, 18,747.27 and 3,138.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,498.50 : 18,747.27 = 3,138.59 : x
2. Step 2: Convert to fraction form
   12,498.50/18,747.27 = 3,138.59/x
3. Step 3: Cross multiply
   12,498.50x = 18,747.27 × 3,138.59
4. Step 4: Simplify right side
   12,498.50x = 58,839,900.41
5. Step 5: Solve for x
   x = 58,839,900.41/12,498.50
6. Step 6: Final answer
   x = 4,707.76