Finding the Fourth Proportional to 2,643.64, 3,654.72 and 2,618.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.64 : 3,654.72 = 2,618.73 : x
2. Step 2: Convert to fraction form
   2,643.64/3,654.72 = 2,618.73/x
3. Step 3: Cross multiply
   2,643.64x = 3,654.72 × 2,618.73
4. Step 4: Simplify right side
   2,643.64x = 9,570,724.91
5. Step 5: Solve for x
   x = 9,570,724.91/2,643.64
6. Step 6: Final answer
   x = 3,620.29