Finding the Fourth Proportional to 10,111.62, 15,139.44 and 5,170.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.62 : 15,139.44 = 5,170.62 : x
2. Step 2: Convert to fraction form
   10,111.62/15,139.44 = 5,170.62/x
3. Step 3: Cross multiply
   10,111.62x = 15,139.44 × 5,170.62
4. Step 4: Simplify right side
   10,111.62x = 78,280,291.25
5. Step 5: Solve for x
   x = 78,280,291.25/10,111.62
6. Step 6: Final answer
   x = 7,741.62