Finding the Fourth Proportional to 2,090.78, 3,137.10 and 859.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,090.78 : 3,137.10 = 859.12 : x
2. Step 2: Convert to fraction form
   2,090.78/3,137.10 = 859.12/x
3. Step 3: Cross multiply
   2,090.78x = 3,137.10 × 859.12
4. Step 4: Simplify right side
   2,090.78x = 2,695,145.35
5. Step 5: Solve for x
   x = 2,695,145.35/2,090.78
6. Step 6: Final answer
   x = 1,289.06