Finding the Fourth Proportional to 1,076.05, 1,613.71 and 345.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.05 : 1,613.71 = 345.45 : x
2. Step 2: Convert to fraction form
   1,076.05/1,613.71 = 345.45/x
3. Step 3: Cross multiply
   1,076.05x = 1,613.71 × 345.45
4. Step 4: Simplify right side
   1,076.05x = 557,454.39
5. Step 5: Solve for x
   x = 557,454.39/1,076.05
6. Step 6: Final answer
   x = 518.06