Finding the Fourth Proportional to 2,085.37, 3,131.12 and 990.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.37 : 3,131.12 = 990.52 : x
2. Step 2: Convert to fraction form
   2,085.37/3,131.12 = 990.52/x
3. Step 3: Cross multiply
   2,085.37x = 3,131.12 × 990.52
4. Step 4: Simplify right side
   2,085.37x = 3,101,431.63
5. Step 5: Solve for x
   x = 3,101,431.63/2,085.37
6. Step 6: Final answer
   x = 1,487.24