Finding the Fourth Proportional to 2,485.60, 3,429.12 and 1,540.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.60 : 3,429.12 = 1,540.72 : x
2. Step 2: Convert to fraction form
   2,485.60/3,429.12 = 1,540.72/x
3. Step 3: Cross multiply
   2,485.60x = 3,429.12 × 1,540.72
4. Step 4: Simplify right side
   2,485.60x = 5,283,313.77
5. Step 5: Solve for x
   x = 5,283,313.77/2,485.60
6. Step 6: Final answer
   x = 2,125.57