Finding the Fourth Proportional to 658,980.72, 987,069.42 and 388,817.70

Step by Step Solution

1. Step 1: Write the proportion equation
   658,980.72 : 987,069.42 = 388,817.70 : x
2. Step 2: Convert to fraction form
   658,980.72/987,069.42 = 388,817.70/x
3. Step 3: Cross multiply
   658,980.72x = 987,069.42 × 388,817.70
4. Step 4: Simplify right side
   658,980.72x = 383,790,061,624.73
5. Step 5: Solve for x
   x = 383,790,061,624.73/658,980.72
6. Step 6: Final answer
   x = 582,399.53