Finding the Fourth Proportional to 1,687.89, 2,527.48 and 1,225.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.89 : 2,527.48 = 1,225.28 : x
2. Step 2: Convert to fraction form
   1,687.89/2,527.48 = 1,225.28/x
3. Step 3: Cross multiply
   1,687.89x = 2,527.48 × 1,225.28
4. Step 4: Simplify right side
   1,687.89x = 3,096,860.88
5. Step 5: Solve for x
   x = 3,096,860.88/1,687.89
6. Step 6: Final answer
   x = 1,834.75