Finding the Fourth Proportional to 1,611.72, 2,226.42 and 1,551.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.72 : 2,226.42 = 1,551.78 : x
2. Step 2: Convert to fraction form
   1,611.72/2,226.42 = 1,551.78/x
3. Step 3: Cross multiply
   1,611.72x = 2,226.42 × 1,551.78
4. Step 4: Simplify right side
   1,611.72x = 3,454,914.03
5. Step 5: Solve for x
   x = 3,454,914.03/1,611.72
6. Step 6: Final answer
   x = 2,143.62