Finding the Fourth Proportional to 2,268.89, 3,129.62 and 1,428.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,268.89 : 3,129.62 = 1,428.87 : x
2. Step 2: Convert to fraction form
   2,268.89/3,129.62 = 1,428.87/x
3. Step 3: Cross multiply
   2,268.89x = 3,129.62 × 1,428.87
4. Step 4: Simplify right side
   2,268.89x = 4,471,824.72
5. Step 5: Solve for x
   x = 4,471,824.72/2,268.89
6. Step 6: Final answer
   x = 1,970.93