Finding the Fourth Proportional to 79,638.84, 109,855.89 and 49,779

Step by Step Solution

1. Step 1: Write the proportion equation
   79,638.84 : 109,855.89 = 49,779 : x
2. Step 2: Convert to fraction form
   79,638.84/109,855.89 = 49,779/x
3. Step 3: Cross multiply
   79,638.84x = 109,855.89 × 49,779
4. Step 4: Simplify right side
   79,638.84x = 5,468,516,348.31
5. Step 5: Solve for x
   x = 5,468,516,348.31/79,638.84
6. Step 6: Final answer
   x = 68,666.45