Finding the Fourth Proportional to 10,380.76, 15,575.69 and 5,449.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.76 : 15,575.69 = 5,449.21 : x
2. Step 2: Convert to fraction form
   10,380.76/15,575.69 = 5,449.21/x
3. Step 3: Cross multiply
   10,380.76x = 15,575.69 × 5,449.21
4. Step 4: Simplify right side
   10,380.76x = 84,875,180.39
5. Step 5: Solve for x
   x = 84,875,180.39/10,380.76
6. Step 6: Final answer
   x = 8,176.20