Finding the Fourth Proportional to 2,231.35, 3,079.01 and 1,392.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.35 : 3,079.01 = 1,392.59 : x
2. Step 2: Convert to fraction form
   2,231.35/3,079.01 = 1,392.59/x
3. Step 3: Cross multiply
   2,231.35x = 3,079.01 × 1,392.59
4. Step 4: Simplify right side
   2,231.35x = 4,287,809.71
5. Step 5: Solve for x
   x = 4,287,809.71/2,231.35
6. Step 6: Final answer
   x = 1,921.62