Finding the Fourth Proportional to 2,651.36, 3,977.69 and 1,872.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,651.36 : 3,977.69 = 1,872.89 : x
2. Step 2: Convert to fraction form
   2,651.36/3,977.69 = 1,872.89/x
3. Step 3: Cross multiply
   2,651.36x = 3,977.69 × 1,872.89
4. Step 4: Simplify right side
   2,651.36x = 7,449,746.57
5. Step 5: Solve for x
   x = 7,449,746.57/2,651.36
6. Step 6: Final answer
   x = 2,809.79