Finding the Fourth Proportional to 2,191.43, 3,023.39 and 1,405.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.43 : 3,023.39 = 1,405.91 : x
2. Step 2: Convert to fraction form
   2,191.43/3,023.39 = 1,405.91/x
3. Step 3: Cross multiply
   2,191.43x = 3,023.39 × 1,405.91
4. Step 4: Simplify right side
   2,191.43x = 4,250,599.12
5. Step 5: Solve for x
   x = 4,250,599.12/2,191.43
6. Step 6: Final answer
   x = 1,939.65