Finding the Fourth Proportional to 3,912.39, 5,870.61 and 2,987.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.39 : 5,870.61 = 2,987.37 : x
2. Step 2: Convert to fraction form
   3,912.39/5,870.61 = 2,987.37/x
3. Step 3: Cross multiply
   3,912.39x = 5,870.61 × 2,987.37
4. Step 4: Simplify right side
   3,912.39x = 17,537,684.20
5. Step 5: Solve for x
   x = 17,537,684.20/3,912.39
6. Step 6: Final answer
   x = 4,482.60