Finding the Fourth Proportional to 2,730.15, 4,087.94 and 1,428.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,730.15 : 4,087.94 = 1,428.89 : x
2. Step 2: Convert to fraction form
   2,730.15/4,087.94 = 1,428.89/x
3. Step 3: Cross multiply
   2,730.15x = 4,087.94 × 1,428.89
4. Step 4: Simplify right side
   2,730.15x = 5,841,189.00
5. Step 5: Solve for x
   x = 5,841,189.00/2,730.15
6. Step 6: Final answer
   x = 2,139.51