Finding the Fourth Proportional to 2,128.82, 2,936.25 and 1,420.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.82 : 2,936.25 = 1,420.30 : x
2. Step 2: Convert to fraction form
   2,128.82/2,936.25 = 1,420.30/x
3. Step 3: Cross multiply
   2,128.82x = 2,936.25 × 1,420.30
4. Step 4: Simplify right side
   2,128.82x = 4,170,359.55
5. Step 5: Solve for x
   x = 4,170,359.55/2,128.82
6. Step 6: Final answer
   x = 1,959.01