Finding the Fourth Proportional to 2,084.40, 3,123 and 1,260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.40 : 3,123 = 1,260.72 : x
2. Step 2: Convert to fraction form
   2,084.40/3,123 = 1,260.72/x
3. Step 3: Cross multiply
   2,084.40x = 3,123 × 1,260.72
4. Step 4: Simplify right side
   2,084.40x = 3,937,228.56
5. Step 5: Solve for x
   x = 3,937,228.56/2,084.40
6. Step 6: Final answer
   x = 1,888.90