Finding the Fourth Proportional to 3,447.60, 5,164.20 and 2,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,447.60 : 5,164.20 = 2,580.72 : x
2. Step 2: Convert to fraction form
   3,447.60/5,164.20 = 2,580.72/x
3. Step 3: Cross multiply
   3,447.60x = 5,164.20 × 2,580.72
4. Step 4: Simplify right side
   3,447.60x = 13,327,354.22
5. Step 5: Solve for x
   x = 13,327,354.22/3,447.60
6. Step 6: Final answer
   x = 3,865.69