Finding the Fourth Proportional to 2,870.10, 3,960.50 and 1,611.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.10 : 3,960.50 = 1,611.09 : x
2. Step 2: Convert to fraction form
   2,870.10/3,960.50 = 1,611.09/x
3. Step 3: Cross multiply
   2,870.10x = 3,960.50 × 1,611.09
4. Step 4: Simplify right side
   2,870.10x = 6,380,713.89
5. Step 5: Solve for x
   x = 6,380,713.89/2,870.10
6. Step 6: Final answer
   x = 2,223.17