Finding the Fourth Proportional to 3,458.58, 5,186.31 and 992.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,458.58 : 5,186.31 = 992.82 : x
2. Step 2: Convert to fraction form
   3,458.58/5,186.31 = 992.82/x
3. Step 3: Cross multiply
   3,458.58x = 5,186.31 × 992.82
4. Step 4: Simplify right side
   3,458.58x = 5,149,072.29
5. Step 5: Solve for x
   x = 5,149,072.29/3,458.58
6. Step 6: Final answer
   x = 1,488.78