Finding the Fourth Proportional to 3,456.62, 5,185.74 and 991.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.62 : 5,185.74 = 991.38 : x
2. Step 2: Convert to fraction form
   3,456.62/5,185.74 = 991.38/x
3. Step 3: Cross multiply
   3,456.62x = 5,185.74 × 991.38
4. Step 4: Simplify right side
   3,456.62x = 5,141,038.92
5. Step 5: Solve for x
   x = 5,141,038.92/3,456.62
6. Step 6: Final answer
   x = 1,487.30