Finding the Fourth Proportional to 10,139.73, 15,205.42 and 3,118.03

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.73 : 15,205.42 = 3,118.03 : x
2. Step 2: Convert to fraction form
   10,139.73/15,205.42 = 3,118.03/x
3. Step 3: Cross multiply
   10,139.73x = 15,205.42 × 3,118.03
4. Step 4: Simplify right side
   10,139.73x = 47,410,955.72
5. Step 5: Solve for x
   x = 47,410,955.72/10,139.73
6. Step 6: Final answer
   x = 4,675.76