Finding the Fourth Proportional to 2,654.72, 3,979.74 and 1,421

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.72 : 3,979.74 = 1,421 : x
2. Step 2: Convert to fraction form
   2,654.72/3,979.74 = 1,421/x
3. Step 3: Cross multiply
   2,654.72x = 3,979.74 × 1,421
4. Step 4: Simplify right side
   2,654.72x = 5,655,210.54
5. Step 5: Solve for x
   x = 5,655,210.54/2,654.72
6. Step 6: Final answer
   x = 2,130.25