Finding the Fourth Proportional to 3,538.72, 5,328.65 and 2,620.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,538.72 : 5,328.65 = 2,620.79 : x
2. Step 2: Convert to fraction form
   3,538.72/5,328.65 = 2,620.79/x
3. Step 3: Cross multiply
   3,538.72x = 5,328.65 × 2,620.79
4. Step 4: Simplify right side
   3,538.72x = 13,965,272.52
5. Step 5: Solve for x
   x = 13,965,272.52/3,538.72
6. Step 6: Final answer
   x = 3,946.42