Finding the Fourth Proportional to 2,090.10, 3,131.30 and 1,309.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,090.10 : 3,131.30 = 1,309.95 : x
2. Step 2: Convert to fraction form
   2,090.10/3,131.30 = 1,309.95/x
3. Step 3: Cross multiply
   2,090.10x = 3,131.30 × 1,309.95
4. Step 4: Simplify right side
   2,090.10x = 4,101,843.16
5. Step 5: Solve for x
   x = 4,101,843.16/2,090.10
6. Step 6: Final answer
   x = 1,962.52