Finding the Fourth Proportional to 452,721.72, 679,007.25 and 137,103.60

Step by Step Solution

1. Step 1: Write the proportion equation
   452,721.72 : 679,007.25 = 137,103.60 : x
2. Step 2: Convert to fraction form
   452,721.72/679,007.25 = 137,103.60/x
3. Step 3: Cross multiply
   452,721.72x = 679,007.25 × 137,103.60
4. Step 4: Simplify right side
   452,721.72x = 93,094,338,401.10
5. Step 5: Solve for x
   x = 93,094,338,401.10/452,721.72
6. Step 6: Final answer
   x = 205,632.59