Finding the Fourth Proportional to 2,179.82, 3,007.86 and 1,393.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.82 : 3,007.86 = 1,393.31 : x
2. Step 2: Convert to fraction form
   2,179.82/3,007.86 = 1,393.31/x
3. Step 3: Cross multiply
   2,179.82x = 3,007.86 × 1,393.31
4. Step 4: Simplify right side
   2,179.82x = 4,190,881.42
5. Step 5: Solve for x
   x = 4,190,881.42/2,179.82
6. Step 6: Final answer
   x = 1,922.58