Finding the Fourth Proportional to 426,983.30, 640,508.01 and 142,674.83

Step by Step Solution

1. Step 1: Write the proportion equation
   426,983.30 : 640,508.01 = 142,674.83 : x
2. Step 2: Convert to fraction form
   426,983.30/640,508.01 = 142,674.83/x
3. Step 3: Cross multiply
   426,983.30x = 640,508.01 × 142,674.83
4. Step 4: Simplify right side
   426,983.30x = 91,384,371,440.39
5. Step 5: Solve for x
   x = 91,384,371,440.39/426,983.30
6. Step 6: Final answer
   x = 214,023.29