Finding the Fourth Proportional to 639,030, 958,003.56 and 428,022

Step by Step Solution

1. Step 1: Write the proportion equation
   639,030 : 958,003.56 = 428,022 : x
2. Step 2: Convert to fraction form
   639,030/958,003.56 = 428,022/x
3. Step 3: Cross multiply
   639,030x = 958,003.56 × 428,022
4. Step 4: Simplify right side
   639,030x = 410,046,599,758.32
5. Step 5: Solve for x
   x = 410,046,599,758.32/639,030
6. Step 6: Final answer
   x = 641,670.34