Finding the Fourth Proportional to 1,076.25, 1,613.55 and 345.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.25 : 1,613.55 = 345.39 : x
2. Step 2: Convert to fraction form
   1,076.25/1,613.55 = 345.39/x
3. Step 3: Cross multiply
   1,076.25x = 1,613.55 × 345.39
4. Step 4: Simplify right side
   1,076.25x = 557,304.03
5. Step 5: Solve for x
   x = 557,304.03/1,076.25
6. Step 6: Final answer
   x = 517.82