Finding the Fourth Proportional to 1,086,522.30, 1,629,710.55 and 287,786.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086,522.30 : 1,629,710.55 = 287,786.70 : x
2. Step 2: Convert to fraction form
   1,086,522.30/1,629,710.55 = 287,786.70/x
3. Step 3: Cross multiply
   1,086,522.30x = 1,629,710.55 × 287,786.70
4. Step 4: Simplify right side
   1,086,522.30x = 469,009,021,139.69
5. Step 5: Solve for x
   x = 469,009,021,139.69/1,086,522.30
6. Step 6: Final answer
   x = 431,660.74