Finding the Fourth Proportional to 10,811.28, 16,218.78 and 3,415.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,811.28 : 16,218.78 = 3,415.59 : x
2. Step 2: Convert to fraction form
   10,811.28/16,218.78 = 3,415.59/x
3. Step 3: Cross multiply
   10,811.28x = 16,218.78 × 3,415.59
4. Step 4: Simplify right side
   10,811.28x = 55,396,702.78
5. Step 5: Solve for x
   x = 55,396,702.78/10,811.28
6. Step 6: Final answer
   x = 5,123.97