Finding the Fourth Proportional to 2,179.98, 3,005.57 and 1,781.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.98 : 3,005.57 = 1,781.23 : x
2. Step 2: Convert to fraction form
   2,179.98/3,005.57 = 1,781.23/x
3. Step 3: Cross multiply
   2,179.98x = 3,005.57 × 1,781.23
4. Step 4: Simplify right side
   2,179.98x = 5,353,611.45
5. Step 5: Solve for x
   x = 5,353,611.45/2,179.98
6. Step 6: Final answer
   x = 2,455.81