Finding the Fourth Proportional to 10,111.20, 15,173.07 and 3,871.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.20 : 15,173.07 = 3,871.72 : x
2. Step 2: Convert to fraction form
   10,111.20/15,173.07 = 3,871.72/x
3. Step 3: Cross multiply
   10,111.20x = 15,173.07 × 3,871.72
4. Step 4: Simplify right side
   10,111.20x = 58,745,878.58
5. Step 5: Solve for x
   x = 58,745,878.58/10,111.20
6. Step 6: Final answer
   x = 5,809.98