Finding the Fourth Proportional to 2,623.82, 3,938.16 and 1,326.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.82 : 3,938.16 = 1,326.20 : x
2. Step 2: Convert to fraction form
   2,623.82/3,938.16 = 1,326.20/x
3. Step 3: Cross multiply
   2,623.82x = 3,938.16 × 1,326.20
4. Step 4: Simplify right side
   2,623.82x = 5,222,787.79
5. Step 5: Solve for x
   x = 5,222,787.79/2,623.82
6. Step 6: Final answer
   x = 1,990.53