Finding the Fourth Proportional to 619,402.89, 928,476.86 and 419,743.47

Step by Step Solution

1. Step 1: Write the proportion equation
   619,402.89 : 928,476.86 = 419,743.47 : x
2. Step 2: Convert to fraction form
   619,402.89/928,476.86 = 419,743.47/x
3. Step 3: Cross multiply
   619,402.89x = 928,476.86 × 419,743.47
4. Step 4: Simplify right side
   619,402.89x = 389,722,096,932.39
5. Step 5: Solve for x
   x = 389,722,096,932.39/619,402.89
6. Step 6: Final answer
   x = 629,189.99