Finding the Fourth Proportional to 78,072.72, 107,713.69 and 50,836.33

Step by Step Solution

1. Step 1: Write the proportion equation
   78,072.72 : 107,713.69 = 50,836.33 : x
2. Step 2: Convert to fraction form
   78,072.72/107,713.69 = 50,836.33/x
3. Step 3: Cross multiply
   78,072.72x = 107,713.69 × 50,836.33
4. Step 4: Simplify right side
   78,072.72x = 5,475,768,690.36
5. Step 5: Solve for x
   x = 5,475,768,690.36/78,072.72
6. Step 6: Final answer
   x = 70,136.77