Finding the Fourth Proportional to 10,911.81, 16,368.37 and 3,416.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,911.81 : 16,368.37 = 3,416.78 : x
2. Step 2: Convert to fraction form
   10,911.81/16,368.37 = 3,416.78/x
3. Step 3: Cross multiply
   10,911.81x = 16,368.37 × 3,416.78
4. Step 4: Simplify right side
   10,911.81x = 55,927,028.86
5. Step 5: Solve for x
   x = 55,927,028.86/10,911.81
6. Step 6: Final answer
   x = 5,125.37