Finding the Fourth Proportional to 1,288,401.59, 1,777,997.39 and 715,441.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,401.59 : 1,777,997.39 = 715,441.71 : x
2. Step 2: Convert to fraction form
   1,288,401.59/1,777,997.39 = 715,441.71/x
3. Step 3: Cross multiply
   1,288,401.59x = 1,777,997.39 × 715,441.71
4. Step 4: Simplify right side
   1,288,401.59x = 1,272,053,496,167.42
5. Step 5: Solve for x
   x = 1,272,053,496,167.42/1,288,401.59
6. Step 6: Final answer
   x = 987,311.33