Finding the Fourth Proportional to 3,859.98, 5,326.77 and 2,091.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.98 : 5,326.77 = 2,091.57 : x
2. Step 2: Convert to fraction form
   3,859.98/5,326.77 = 2,091.57/x
3. Step 3: Cross multiply
   3,859.98x = 5,326.77 × 2,091.57
4. Step 4: Simplify right side
   3,859.98x = 11,141,312.33
5. Step 5: Solve for x
   x = 11,141,312.33/3,859.98
6. Step 6: Final answer
   x = 2,886.37