Finding the Fourth Proportional to 79,640.34, 109,857.96 and 49,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   79,640.34 : 109,857.96 = 49,780.50 : x
2. Step 2: Convert to fraction form
   79,640.34/109,857.96 = 49,780.50/x
3. Step 3: Cross multiply
   79,640.34x = 109,857.96 × 49,780.50
4. Step 4: Simplify right side
   79,640.34x = 5,468,784,177.78
5. Step 5: Solve for x
   x = 5,468,784,177.78/79,640.34
6. Step 6: Final answer
   x = 68,668.52