Finding the Fourth Proportional to 2,619.56, 3,611.63 and 2,145.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.56 : 3,611.63 = 2,145.71 : x
2. Step 2: Convert to fraction form
   2,619.56/3,611.63 = 2,145.71/x
3. Step 3: Cross multiply
   2,619.56x = 3,611.63 × 2,145.71
4. Step 4: Simplify right side
   2,619.56x = 7,749,481.82
5. Step 5: Solve for x
   x = 7,749,481.82/2,619.56
6. Step 6: Final answer
   x = 2,958.32