Finding the Fourth Proportional to 79,639.84, 109,857.27 and 49,780

Step by Step Solution

1. Step 1: Write the proportion equation
   79,639.84 : 109,857.27 = 49,780 : x
2. Step 2: Convert to fraction form
   79,639.84/109,857.27 = 49,780/x
3. Step 3: Cross multiply
   79,639.84x = 109,857.27 × 49,780
4. Step 4: Simplify right side
   79,639.84x = 5,468,694,900.60
5. Step 5: Solve for x
   x = 5,468,694,900.60/79,639.84
6. Step 6: Final answer
   x = 68,667.83