Finding the Fourth Proportional to 3,904.72, 5,385.48 and 2,507.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,904.72 : 5,385.48 = 2,507.60 : x
2. Step 2: Convert to fraction form
   3,904.72/5,385.48 = 2,507.60/x
3. Step 3: Cross multiply
   3,904.72x = 5,385.48 × 2,507.60
4. Step 4: Simplify right side
   3,904.72x = 13,504,629.65
5. Step 5: Solve for x
   x = 13,504,629.65/3,904.72
6. Step 6: Final answer
   x = 3,458.54