Finding the Fourth Proportional to 1,613.25, 2,417.82 and 687.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.25 : 2,417.82 = 687.72 : x
2. Step 2: Convert to fraction form
   1,613.25/2,417.82 = 687.72/x
3. Step 3: Cross multiply
   1,613.25x = 2,417.82 × 687.72
4. Step 4: Simplify right side
   1,613.25x = 1,662,783.17
5. Step 5: Solve for x
   x = 1,662,783.17/1,613.25
6. Step 6: Final answer
   x = 1,030.70