Finding the Fourth Proportional to 715,776, 987,789.78 and 389,110.98

Step by Step Solution

1. Step 1: Write the proportion equation
   715,776 : 987,789.78 = 389,110.98 : x
2. Step 2: Convert to fraction form
   715,776/987,789.78 = 389,110.98/x
3. Step 3: Cross multiply
   715,776x = 987,789.78 × 389,110.98
4. Step 4: Simplify right side
   715,776x = 384,359,849,329.78
5. Step 5: Solve for x
   x = 384,359,849,329.78/715,776
6. Step 6: Final answer
   x = 536,983.43