Finding the Fourth Proportional to 424,216.18, 636,189.01 and 139,853.73

Step by Step Solution

1. Step 1: Write the proportion equation
   424,216.18 : 636,189.01 = 139,853.73 : x
2. Step 2: Convert to fraction form
   424,216.18/636,189.01 = 139,853.73/x
3. Step 3: Cross multiply
   424,216.18x = 636,189.01 × 139,853.73
4. Step 4: Simplify right side
   424,216.18x = 88,973,406,033.51
5. Step 5: Solve for x
   x = 88,973,406,033.51/424,216.18
6. Step 6: Final answer
   x = 209,736.00