Finding the Fourth Proportional to 715,773.69, 987,786.72 and 389,108.79

Step by Step Solution

1. Step 1: Write the proportion equation
   715,773.69 : 987,786.72 = 389,108.79 : x
2. Step 2: Convert to fraction form
   715,773.69/987,786.72 = 389,108.79/x
3. Step 3: Cross multiply
   715,773.69x = 987,786.72 × 389,108.79
4. Step 4: Simplify right side
   715,773.69x = 384,356,495,397.27
5. Step 5: Solve for x
   x = 384,356,495,397.27/715,773.69
6. Step 6: Final answer
   x = 536,980.47