Finding the Fourth Proportional to 1,945.76, 2,904.42 and 1,687.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.76 : 2,904.42 = 1,687.57 : x
2. Step 2: Convert to fraction form
   1,945.76/2,904.42 = 1,687.57/x
3. Step 3: Cross multiply
   1,945.76x = 2,904.42 × 1,687.57
4. Step 4: Simplify right side
   1,945.76x = 4,901,411.13
5. Step 5: Solve for x
   x = 4,901,411.13/1,945.76
6. Step 6: Final answer
   x = 2,519.03