Finding the Fourth Proportional to 2,131.52, 3,191.40 and 1,611.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.52 : 3,191.40 = 1,611.77 : x
2. Step 2: Convert to fraction form
   2,131.52/3,191.40 = 1,611.77/x
3. Step 3: Cross multiply
   2,131.52x = 3,191.40 × 1,611.77
4. Step 4: Simplify right side
   2,131.52x = 5,143,786.82
5. Step 5: Solve for x
   x = 5,143,786.82/2,131.52
6. Step 6: Final answer
   x = 2,413.21