Finding the Fourth Proportional to 2,790.81, 3,851.89 and 1,611.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.81 : 3,851.89 = 1,611.72 : x
2. Step 2: Convert to fraction form
   2,790.81/3,851.89 = 1,611.72/x
3. Step 3: Cross multiply
   2,790.81x = 3,851.89 × 1,611.72
4. Step 4: Simplify right side
   2,790.81x = 6,208,164.12
5. Step 5: Solve for x
   x = 6,208,164.12/2,790.81
6. Step 6: Final answer
   x = 2,224.50