Finding the Fourth Proportional to 3,870.81, 5,806.53 and 2,321.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.81 : 5,806.53 = 2,321.39 : x
2. Step 2: Convert to fraction form
   3,870.81/5,806.53 = 2,321.39/x
3. Step 3: Cross multiply
   3,870.81x = 5,806.53 × 2,321.39
4. Step 4: Simplify right side
   3,870.81x = 13,479,191.64
5. Step 5: Solve for x
   x = 13,479,191.64/3,870.81
6. Step 6: Final answer
   x = 3,482.27