Finding the Fourth Proportional to 10,990.71, 16,486.34 and 3,199.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,990.71 : 16,486.34 = 3,199.59 : x
2. Step 2: Convert to fraction form
   10,990.71/16,486.34 = 3,199.59/x
3. Step 3: Cross multiply
   10,990.71x = 16,486.34 × 3,199.59
4. Step 4: Simplify right side
   10,990.71x = 52,749,512.60
5. Step 5: Solve for x
   x = 52,749,512.60/10,990.71
6. Step 6: Final answer
   x = 4,799.46