Finding the Fourth Proportional to 2,870.25, 3,960.72 and 1,611.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.25 : 3,960.72 = 1,611.13 : x
2. Step 2: Convert to fraction form
   2,870.25/3,960.72 = 1,611.13/x
3. Step 3: Cross multiply
   2,870.25x = 3,960.72 × 1,611.13
4. Step 4: Simplify right side
   2,870.25x = 6,381,234.81
5. Step 5: Solve for x
   x = 6,381,234.81/2,870.25
6. Step 6: Final answer
   x = 2,223.23