Finding the Fourth Proportional to 10,556.34, 15,831.81 and 3,980.58

Step by Step Solution

1. Step 1: Write the proportion equation
   10,556.34 : 15,831.81 = 3,980.58 : x
2. Step 2: Convert to fraction form
   10,556.34/15,831.81 = 3,980.58/x
3. Step 3: Cross multiply
   10,556.34x = 15,831.81 × 3,980.58
4. Step 4: Simplify right side
   10,556.34x = 63,019,786.25
5. Step 5: Solve for x
   x = 63,019,786.25/10,556.34
6. Step 6: Final answer
   x = 5,969.85