Finding the Fourth Proportional to 1,426.50, 2,139.83 and 400.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.50 : 2,139.83 = 400.58 : x
2. Step 2: Convert to fraction form
   1,426.50/2,139.83 = 400.58/x
3. Step 3: Cross multiply
   1,426.50x = 2,139.83 × 400.58
4. Step 4: Simplify right side
   1,426.50x = 857,173.10
5. Step 5: Solve for x
   x = 857,173.10/1,426.50
6. Step 6: Final answer
   x = 600.89