Finding the Fourth Proportional to 711,389,953.50, 981,718,135.83 and 385,807,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   711,389,953.50 : 981,718,135.83 = 385,807,105.50 : x
2. Step 2: Convert to fraction form
   711,389,953.50/981,718,135.83 = 385,807,105.50/x
3. Step 3: Cross multiply
   711,389,953.50x = 981,718,135.83 × 385,807,105.50
4. Step 4: Simplify right side
   711,389,953.50x = 378,753,832,401,428,160
5. Step 5: Solve for x
   x = 378,753,832,401,428,160/711,389,953.50
6. Step 6: Final answer
   x = 532,413,805.59