Finding the Fourth Proportional to 424,036.82, 636,148.99 and 139,715.89

Step by Step Solution

1. Step 1: Write the proportion equation
   424,036.82 : 636,148.99 = 139,715.89 : x
2. Step 2: Convert to fraction form
   424,036.82/636,148.99 = 139,715.89/x
3. Step 3: Cross multiply
   424,036.82x = 636,148.99 × 139,715.89
4. Step 4: Simplify right side
   424,036.82x = 88,880,120,894.72
5. Step 5: Solve for x
   x = 88,880,120,894.72/424,036.82
6. Step 6: Final answer
   x = 209,604.72