Finding the Fourth Proportional to 3,865.30, 5,806.59 and 3,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,865.30 : 5,806.59 = 3,719.50 : x
2. Step 2: Convert to fraction form
   3,865.30/5,806.59 = 3,719.50/x
3. Step 3: Cross multiply
   3,865.30x = 5,806.59 × 3,719.50
4. Step 4: Simplify right side
   3,865.30x = 21,597,611.51
5. Step 5: Solve for x
   x = 21,597,611.51/3,865.30
6. Step 6: Final answer
   x = 5,587.56