Finding the Fourth Proportional to 10,552.56, 15,831.17 and 3,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,552.56 : 15,831.17 = 3,978.80 : x
2. Step 2: Convert to fraction form
   10,552.56/15,831.17 = 3,978.80/x
3. Step 3: Cross multiply
   10,552.56x = 15,831.17 × 3,978.80
4. Step 4: Simplify right side
   10,552.56x = 62,989,059.20
5. Step 5: Solve for x
   x = 62,989,059.20/10,552.56
6. Step 6: Final answer
   x = 5,969.08