Finding the Fourth Proportional to 1,189,815.31, 1,784,052.27 and 390,882.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,815.31 : 1,784,052.27 = 390,882.34 : x
2. Step 2: Convert to fraction form
   1,189,815.31/1,784,052.27 = 390,882.34/x
3. Step 3: Cross multiply
   1,189,815.31x = 1,784,052.27 × 390,882.34
4. Step 4: Simplify right side
   1,189,815.31x = 697,354,521,519.78
5. Step 5: Solve for x
   x = 697,354,521,519.78/1,189,815.31
6. Step 6: Final answer
   x = 586,103.17