Finding the Fourth Proportional to 428,978.73, 591,990.42 and 235,387.72

Step by Step Solution

1. Step 1: Write the proportion equation
   428,978.73 : 591,990.42 = 235,387.72 : x
2. Step 2: Convert to fraction form
   428,978.73/591,990.42 = 235,387.72/x
3. Step 3: Cross multiply
   428,978.73x = 591,990.42 × 235,387.72
4. Step 4: Simplify right side
   428,978.73x = 139,347,275,225.64
5. Step 5: Solve for x
   x = 139,347,275,225.64/428,978.73
6. Step 6: Final answer
   x = 324,834.93