Finding the Fourth Proportional to 424,155.18, 636,216.15 and 143,672.42

Step by Step Solution

1. Step 1: Write the proportion equation
   424,155.18 : 636,216.15 = 143,672.42 : x
2. Step 2: Convert to fraction form
   424,155.18/636,216.15 = 143,672.42/x
3. Step 3: Cross multiply
   424,155.18x = 636,216.15 × 143,672.42
4. Step 4: Simplify right side
   424,155.18x = 91,406,713,913.58
5. Step 5: Solve for x
   x = 91,406,713,913.58/424,155.18
6. Step 6: Final answer
   x = 215,503.00