Finding the Fourth Proportional to 2,090.89, 3,133.61 and 856.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,090.89 : 3,133.61 = 856.86 : x
2. Step 2: Convert to fraction form
   2,090.89/3,133.61 = 856.86/x
3. Step 3: Cross multiply
   2,090.89x = 3,133.61 × 856.86
4. Step 4: Simplify right side
   2,090.89x = 2,685,055.71
5. Step 5: Solve for x
   x = 2,685,055.71/2,090.89
6. Step 6: Final answer
   x = 1,284.17