Finding the Fourth Proportional to 1,426.16, 2,139.30 and 452.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.16 : 2,139.30 = 452.27 : x
2. Step 2: Convert to fraction form
   1,426.16/2,139.30 = 452.27/x
3. Step 3: Cross multiply
   1,426.16x = 2,139.30 × 452.27
4. Step 4: Simplify right side
   1,426.16x = 967,530.51
5. Step 5: Solve for x
   x = 967,530.51/1,426.16
6. Step 6: Final answer
   x = 678.42