Finding the Fourth Proportional to 1,189,815.50, 1,784,052.56 and 390,882.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,815.50 : 1,784,052.56 = 390,882.53 : x
2. Step 2: Convert to fraction form
   1,189,815.50/1,784,052.56 = 390,882.53/x
3. Step 3: Cross multiply
   1,189,815.50x = 1,784,052.56 × 390,882.53
4. Step 4: Simplify right side
   1,189,815.50x = 697,354,967,431.10
5. Step 5: Solve for x
   x = 697,354,967,431.10/1,189,815.50
6. Step 6: Final answer
   x = 586,103.45