Finding the Fourth Proportional to 426,536.07, 639,738.50 and 142,231.56

Step by Step Solution

1. Step 1: Write the proportion equation
   426,536.07 : 639,738.50 = 142,231.56 : x
2. Step 2: Convert to fraction form
   426,536.07/639,738.50 = 142,231.56/x
3. Step 3: Cross multiply
   426,536.07x = 639,738.50 × 142,231.56
4. Step 4: Simplify right side
   426,536.07x = 90,991,004,135.90
5. Step 5: Solve for x
   x = 90,991,004,135.90/426,536.07
6. Step 6: Final answer
   x = 213,325.46