Finding the Fourth Proportional to 3,870.59, 5,804.26 and 2,638.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.59 : 5,804.26 = 2,638.98 : x
2. Step 2: Convert to fraction form
   3,870.59/5,804.26 = 2,638.98/x
3. Step 3: Cross multiply
   3,870.59x = 5,804.26 × 2,638.98
4. Step 4: Simplify right side
   3,870.59x = 15,317,319.46
5. Step 5: Solve for x
   x = 15,317,319.46/3,870.59
6. Step 6: Final answer
   x = 3,957.37