Finding the Fourth Proportional to 1,405.71, 1,940.46 and 1,259.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.71 : 1,940.46 = 1,259.91 : x
2. Step 2: Convert to fraction form
   1,405.71/1,940.46 = 1,259.91/x
3. Step 3: Cross multiply
   1,405.71x = 1,940.46 × 1,259.91
4. Step 4: Simplify right side
   1,405.71x = 2,444,804.96
5. Step 5: Solve for x
   x = 2,444,804.96/1,405.71
6. Step 6: Final answer
   x = 1,739.20