Finding the Fourth Proportional to 2,664.34, 3,990.32 and 2,572.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.34 : 3,990.32 = 2,572.06 : x
2. Step 2: Convert to fraction form
   2,664.34/3,990.32 = 2,572.06/x
3. Step 3: Cross multiply
   2,664.34x = 3,990.32 × 2,572.06
4. Step 4: Simplify right side
   2,664.34x = 10,263,342.46
5. Step 5: Solve for x
   x = 10,263,342.46/2,664.34
6. Step 6: Final answer
   x = 3,852.11