Finding the Fourth Proportional to 3,456.95, 5,185.38 and 991.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.95 : 5,185.38 = 991.77 : x
2. Step 2: Convert to fraction form
   3,456.95/5,185.38 = 991.77/x
3. Step 3: Cross multiply
   3,456.95x = 5,185.38 × 991.77
4. Step 4: Simplify right side
   3,456.95x = 5,142,688.60
5. Step 5: Solve for x
   x = 5,142,688.60/3,456.95
6. Step 6: Final answer
   x = 1,487.64