Finding the Fourth Proportional to 2,085.46, 3,128.10 and 699.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.46 : 3,128.10 = 699.46 : x
2. Step 2: Convert to fraction form
   2,085.46/3,128.10 = 699.46/x
3. Step 3: Cross multiply
   2,085.46x = 3,128.10 × 699.46
4. Step 4: Simplify right side
   2,085.46x = 2,187,980.83
5. Step 5: Solve for x
   x = 2,187,980.83/2,085.46
6. Step 6: Final answer
   x = 1,049.16