Finding the Fourth Proportional to 711,428.34, 981,778.83 and 389,131.35

Step by Step Solution

1. Step 1: Write the proportion equation
   711,428.34 : 981,778.83 = 389,131.35 : x
2. Step 2: Convert to fraction form
   711,428.34/981,778.83 = 389,131.35/x
3. Step 3: Cross multiply
   711,428.34x = 981,778.83 × 389,131.35
4. Step 4: Simplify right side
   711,428.34x = 382,040,921,519.32
5. Step 5: Solve for x
   x = 382,040,921,519.32/711,428.34
6. Step 6: Final answer
   x = 537,005.49