Finding the Fourth Proportional to 2,651.78, 3,979.71 and 1,420.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,651.78 : 3,979.71 = 1,420.22 : x
2. Step 2: Convert to fraction form
   2,651.78/3,979.71 = 1,420.22/x
3. Step 3: Cross multiply
   2,651.78x = 3,979.71 × 1,420.22
4. Step 4: Simplify right side
   2,651.78x = 5,652,073.69
5. Step 5: Solve for x
   x = 5,652,073.69/2,651.78
6. Step 6: Final answer
   x = 2,131.42