Finding the Fourth Proportional to 3,397.89, 4,690.73 and 2,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,397.89 : 4,690.73 = 2,139.55 : x
2. Step 2: Convert to fraction form
   3,397.89/4,690.73 = 2,139.55/x
3. Step 3: Cross multiply
   3,397.89x = 4,690.73 × 2,139.55
4. Step 4: Simplify right side
   3,397.89x = 10,036,051.37
5. Step 5: Solve for x
   x = 10,036,051.37/3,397.89
6. Step 6: Final answer
   x = 2,953.61