Finding the Fourth Proportional to 2,485.07, 3,428.29 and 1,687.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.07 : 3,428.29 = 1,687.42 : x
2. Step 2: Convert to fraction form
   2,485.07/3,428.29 = 1,687.42/x
3. Step 3: Cross multiply
   2,485.07x = 3,428.29 × 1,687.42
4. Step 4: Simplify right side
   2,485.07x = 5,784,965.11
5. Step 5: Solve for x
   x = 5,784,965.11/2,485.07
6. Step 6: Final answer
   x = 2,327.89