Finding the Fourth Proportional to 1,662.17, 2,493.18 and 687.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.17 : 2,493.18 = 687.59 : x
2. Step 2: Convert to fraction form
   1,662.17/2,493.18 = 687.59/x
3. Step 3: Cross multiply
   1,662.17x = 2,493.18 × 687.59
4. Step 4: Simplify right side
   1,662.17x = 1,714,282.52
5. Step 5: Solve for x
   x = 1,714,282.52/1,662.17
6. Step 6: Final answer
   x = 1,031.35