Finding the Fourth Proportional to 2,637.13, 3,955.55 and 1,338.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,637.13 : 3,955.55 = 1,338.57 : x
2. Step 2: Convert to fraction form
   2,637.13/3,955.55 = 1,338.57/x
3. Step 3: Cross multiply
   2,637.13x = 3,955.55 × 1,338.57
4. Step 4: Simplify right side
   2,637.13x = 5,294,780.56
5. Step 5: Solve for x
   x = 5,294,780.56/2,637.13
6. Step 6: Final answer
   x = 2,007.78