Finding the Fourth Proportional to 2,643.26, 3,957.59 and 1,992.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.26 : 3,957.59 = 1,992.02 : x
2. Step 2: Convert to fraction form
   2,643.26/3,957.59 = 1,992.02/x
3. Step 3: Cross multiply
   2,643.26x = 3,957.59 × 1,992.02
4. Step 4: Simplify right side
   2,643.26x = 7,883,598.43
5. Step 5: Solve for x
   x = 7,883,598.43/2,643.26
6. Step 6: Final answer
   x = 2,982.53