Finding the Fourth Proportional to 3,456.97, 5,186.34 and 991.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.97 : 5,186.34 = 991.96 : x
2. Step 2: Convert to fraction form
   3,456.97/5,186.34 = 991.96/x
3. Step 3: Cross multiply
   3,456.97x = 5,186.34 × 991.96
4. Step 4: Simplify right side
   3,456.97x = 5,144,628.86
5. Step 5: Solve for x
   x = 5,144,628.86/3,456.97
6. Step 6: Final answer
   x = 1,488.19