Finding the Fourth Proportional to 2,870.17, 3,960.80 and 1,611.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.17 : 3,960.80 = 1,611.25 : x
2. Step 2: Convert to fraction form
   2,870.17/3,960.80 = 1,611.25/x
3. Step 3: Cross multiply
   2,870.17x = 3,960.80 × 1,611.25
4. Step 4: Simplify right side
   2,870.17x = 6,381,830.94
5. Step 5: Solve for x
   x = 6,381,830.94/2,870.17
6. Step 6: Final answer
   x = 2,223.50