Finding the Fourth Proportional to 639,363, 959,061.78 and 196,131

Step by Step Solution

1. Step 1: Write the proportion equation
   639,363 : 959,061.78 = 196,131 : x
2. Step 2: Convert to fraction form
   639,363/959,061.78 = 196,131/x
3. Step 3: Cross multiply
   639,363x = 959,061.78 × 196,131
4. Step 4: Simplify right side
   639,363x = 188,101,745,973.18
5. Step 5: Solve for x
   x = 188,101,745,973.18/639,363
6. Step 6: Final answer
   x = 294,201.80