Finding the Fourth Proportional to 861,001.28, 1,291,792.55 and 381,162.89

Step by Step Solution

1. Step 1: Write the proportion equation
   861,001.28 : 1,291,792.55 = 381,162.89 : x
2. Step 2: Convert to fraction form
   861,001.28/1,291,792.55 = 381,162.89/x
3. Step 3: Cross multiply
   861,001.28x = 1,291,792.55 × 381,162.89
4. Step 4: Simplify right side
   861,001.28x = 492,383,373,273.69
5. Step 5: Solve for x
   x = 492,383,373,273.69/861,001.28
6. Step 6: Final answer
   x = 571,872.99