Finding the Fourth Proportional to 1,076.27, 1,613.86 and 345.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.27 : 1,613.86 = 345.74 : x
2. Step 2: Convert to fraction form
   1,076.27/1,613.86 = 345.74/x
3. Step 3: Cross multiply
   1,076.27x = 1,613.86 × 345.74
4. Step 4: Simplify right side
   1,076.27x = 557,967.02
5. Step 5: Solve for x
   x = 557,967.02/1,076.27
6. Step 6: Final answer
   x = 518.43