Finding the Fourth Proportional to 1,401.06, 2,101.83 and 426.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.06 : 2,101.83 = 426.94 : x
2. Step 2: Convert to fraction form
   1,401.06/2,101.83 = 426.94/x
3. Step 3: Cross multiply
   1,401.06x = 2,101.83 × 426.94
4. Step 4: Simplify right side
   1,401.06x = 897,350.85
5. Step 5: Solve for x
   x = 897,350.85/1,401.06
6. Step 6: Final answer
   x = 640.48