Finding the Fourth Proportional to 3,859.86, 5,326.61 and 2,091.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.86 : 5,326.61 = 2,091.45 : x
2. Step 2: Convert to fraction form
   3,859.86/5,326.61 = 2,091.45/x
3. Step 3: Cross multiply
   3,859.86x = 5,326.61 × 2,091.45
4. Step 4: Simplify right side
   3,859.86x = 11,140,328.03
5. Step 5: Solve for x
   x = 11,140,328.03/3,859.86
6. Step 6: Final answer
   x = 2,886.20