Finding the Fourth Proportional to 1,687.76, 2,530.56 and 1,108.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.76 : 2,530.56 = 1,108.88 : x
2. Step 2: Convert to fraction form
   1,687.76/2,530.56 = 1,108.88/x
3. Step 3: Cross multiply
   1,687.76x = 2,530.56 × 1,108.88
4. Step 4: Simplify right side
   1,687.76x = 2,806,087.37
5. Step 5: Solve for x
   x = 2,806,087.37/1,687.76
6. Step 6: Final answer
   x = 1,662.61