Finding the Fourth Proportional to 3,904.32, 5,388.40 and 2,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,904.32 : 5,388.40 = 2,580.72 : x
2. Step 2: Convert to fraction form
   3,904.32/5,388.40 = 2,580.72/x
3. Step 3: Cross multiply
   3,904.32x = 5,388.40 × 2,580.72
4. Step 4: Simplify right side
   3,904.32x = 13,905,951.65
5. Step 5: Solve for x
   x = 13,905,951.65/3,904.32
6. Step 6: Final answer
   x = 3,561.68