Finding the Fourth Proportional to 510,793.05, 704,978.49 and 389,705.55

Step by Step Solution

1. Step 1: Write the proportion equation
   510,793.05 : 704,978.49 = 389,705.55 : x
2. Step 2: Convert to fraction form
   510,793.05/704,978.49 = 389,705.55/x
3. Step 3: Cross multiply
   510,793.05x = 704,978.49 × 389,705.55
4. Step 4: Simplify right side
   510,793.05x = 274,734,029,001.35
5. Step 5: Solve for x
   x = 274,734,029,001.35/510,793.05
6. Step 6: Final answer
   x = 537,857.80