Finding the Fourth Proportional to 2,638.11, 3,955.86 and 1,077.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.11 : 3,955.86 = 1,077.69 : x
2. Step 2: Convert to fraction form
   2,638.11/3,955.86 = 1,077.69/x
3. Step 3: Cross multiply
   2,638.11x = 3,955.86 × 1,077.69
4. Step 4: Simplify right side
   2,638.11x = 4,263,190.76
5. Step 5: Solve for x
   x = 4,263,190.76/2,638.11
6. Step 6: Final answer
   x = 1,616.00