Finding the Fourth Proportional to 2,504.15, 3,455.75 and 1,385.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,504.15 : 3,455.75 = 1,385.06 : x
2. Step 2: Convert to fraction form
   2,504.15/3,455.75 = 1,385.06/x
3. Step 3: Cross multiply
   2,504.15x = 3,455.75 × 1,385.06
4. Step 4: Simplify right side
   2,504.15x = 4,786,421.10
5. Step 5: Solve for x
   x = 4,786,421.10/2,504.15
6. Step 6: Final answer
   x = 1,911.40