Finding the Fourth Proportional to 2,085.45, 3,124.67 and 1,261.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.45 : 3,124.67 = 1,261.22 : x
2. Step 2: Convert to fraction form
   2,085.45/3,124.67 = 1,261.22/x
3. Step 3: Cross multiply
   2,085.45x = 3,124.67 × 1,261.22
4. Step 4: Simplify right side
   2,085.45x = 3,940,874.37
5. Step 5: Solve for x
   x = 3,940,874.37/2,085.45
6. Step 6: Final answer
   x = 1,889.70