Finding the Fourth Proportional to 405,978.38, 609,025.92 and 125,517.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,978.38 : 609,025.92 = 125,517.50 : x
2. Step 2: Convert to fraction form
   405,978.38/609,025.92 = 125,517.50/x
3. Step 3: Cross multiply
   405,978.38x = 609,025.92 × 125,517.50
4. Step 4: Simplify right side
   405,978.38x = 76,443,410,913.60
5. Step 5: Solve for x
   x = 76,443,410,913.60/405,978.38
6. Step 6: Final answer
   x = 188,294.29