Finding the Fourth Proportional to 10,899.71, 16,350.15 and 3,503.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,899.71 : 16,350.15 = 3,503.60 : x
2. Step 2: Convert to fraction form
   10,899.71/16,350.15 = 3,503.60/x
3. Step 3: Cross multiply
   10,899.71x = 16,350.15 × 3,503.60
4. Step 4: Simplify right side
   10,899.71x = 57,284,303.79
5. Step 5: Solve for x
   x = 57,284,303.79/10,899.71
6. Step 6: Final answer
   x = 5,255.58