Finding the Fourth Proportional to 2,489.89, 3,436.06 and 1,427.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,489.89 : 3,436.06 = 1,427.72 : x
2. Step 2: Convert to fraction form
   2,489.89/3,436.06 = 1,427.72/x
3. Step 3: Cross multiply
   2,489.89x = 3,436.06 × 1,427.72
4. Step 4: Simplify right side
   2,489.89x = 4,905,731.58
5. Step 5: Solve for x
   x = 4,905,731.58/2,489.89
6. Step 6: Final answer
   x = 1,970.26