Finding the Fourth Proportional to 3,188.58, 4,397.94 and 3,139.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,188.58 : 4,397.94 = 3,139.98 : x
2. Step 2: Convert to fraction form
   3,188.58/4,397.94 = 3,139.98/x
3. Step 3: Cross multiply
   3,188.58x = 4,397.94 × 3,139.98
4. Step 4: Simplify right side
   3,188.58x = 13,809,443.64
5. Step 5: Solve for x
   x = 13,809,443.64/3,188.58
6. Step 6: Final answer
   x = 4,330.91