Finding the Fourth Proportional to 2,664.58, 3,990.69 and 2,572.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.58 : 3,990.69 = 2,572.30 : x
2. Step 2: Convert to fraction form
   2,664.58/3,990.69 = 2,572.30/x
3. Step 3: Cross multiply
   2,664.58x = 3,990.69 × 2,572.30
4. Step 4: Simplify right side
   2,664.58x = 10,265,251.89
5. Step 5: Solve for x
   x = 10,265,251.89/2,664.58
6. Step 6: Final answer
   x = 3,852.48