Finding the Fourth Proportional to 10,141.76, 15,220.56 and 5,211.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,141.76 : 15,220.56 = 5,211.20 : x
2. Step 2: Convert to fraction form
   10,141.76/15,220.56 = 5,211.20/x
3. Step 3: Cross multiply
   10,141.76x = 15,220.56 × 5,211.20
4. Step 4: Simplify right side
   10,141.76x = 79,317,382.27
5. Step 5: Solve for x
   x = 79,317,382.27/10,141.76
6. Step 6: Final answer
   x = 7,820.87