Finding the Fourth Proportional to 200,685.30, 301,078.15 and 141,636.30

Step by Step Solution

1. Step 1: Write the proportion equation
   200,685.30 : 301,078.15 = 141,636.30 : x
2. Step 2: Convert to fraction form
   200,685.30/301,078.15 = 141,636.30/x
3. Step 3: Cross multiply
   200,685.30x = 301,078.15 × 141,636.30
4. Step 4: Simplify right side
   200,685.30x = 42,643,595,176.85
5. Step 5: Solve for x
   x = 42,643,595,176.85/200,685.30
6. Step 6: Final answer
   x = 212,489.88