Finding the Fourth Proportional to 3,859.89, 5,326.65 and 2,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.89 : 5,326.65 = 2,091.50 : x
2. Step 2: Convert to fraction form
   3,859.89/5,326.65 = 2,091.50/x
3. Step 3: Cross multiply
   3,859.89x = 5,326.65 × 2,091.50
4. Step 4: Simplify right side
   3,859.89x = 11,140,688.48
5. Step 5: Solve for x
   x = 11,140,688.48/3,859.89
6. Step 6: Final answer
   x = 2,886.27