Finding the Fourth Proportional to 3,889.61, 5,809.61 and 3,518.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889.61 : 5,809.61 = 3,518.84 : x
2. Step 2: Convert to fraction form
   3,889.61/5,809.61 = 3,518.84/x
3. Step 3: Cross multiply
   3,889.61x = 5,809.61 × 3,518.84
4. Step 4: Simplify right side
   3,889.61x = 20,443,111.37
5. Step 5: Solve for x
   x = 20,443,111.37/3,889.61
6. Step 6: Final answer
   x = 5,255.83