Finding the Fourth Proportional to 1,405.83, 2,108.13 and 1,081.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.83 : 2,108.13 = 1,081.42 : x
2. Step 2: Convert to fraction form
   1,405.83/2,108.13 = 1,081.42/x
3. Step 3: Cross multiply
   1,405.83x = 2,108.13 × 1,081.42
4. Step 4: Simplify right side
   1,405.83x = 2,279,773.94
5. Step 5: Solve for x
   x = 2,279,773.94/1,405.83
6. Step 6: Final answer
   x = 1,621.66