Finding the Fourth Proportional to 2,085.16, 3,128.49 and 975.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.16 : 3,128.49 = 975.55 : x
2. Step 2: Convert to fraction form
   2,085.16/3,128.49 = 975.55/x
3. Step 3: Cross multiply
   2,085.16x = 3,128.49 × 975.55
4. Step 4: Simplify right side
   2,085.16x = 3,051,998.42
5. Step 5: Solve for x
   x = 3,051,998.42/2,085.16
6. Step 6: Final answer
   x = 1,463.68