Finding the Fourth Proportional to 2,565.60, 3,539.34 and 1,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.60 : 3,539.34 = 1,620.72 : x
2. Step 2: Convert to fraction form
   2,565.60/3,539.34 = 1,620.72/x
3. Step 3: Cross multiply
   2,565.60x = 3,539.34 × 1,620.72
4. Step 4: Simplify right side
   2,565.60x = 5,736,279.12
5. Step 5: Solve for x
   x = 5,736,279.12/2,565.60
6. Step 6: Final answer
   x = 2,235.84