Finding the Fourth Proportional to 2,084.60, 3,128.50 and 1,260.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.60 : 3,128.50 = 1,260.38 : x
2. Step 2: Convert to fraction form
   2,084.60/3,128.50 = 1,260.38/x
3. Step 3: Cross multiply
   2,084.60x = 3,128.50 × 1,260.38
4. Step 4: Simplify right side
   2,084.60x = 3,943,098.83
5. Step 5: Solve for x
   x = 3,943,098.83/2,084.60
6. Step 6: Final answer
   x = 1,891.54