Finding the Fourth Proportional to 78,930.72, 108,936.72 and 50,666.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,930.72 : 108,936.72 = 50,666.40 : x
2. Step 2: Convert to fraction form
   78,930.72/108,936.72 = 50,666.40/x
3. Step 3: Cross multiply
   78,930.72x = 108,936.72 × 50,666.40
4. Step 4: Simplify right side
   78,930.72x = 5,519,431,430.21
5. Step 5: Solve for x
   x = 5,519,431,430.21/78,930.72
6. Step 6: Final answer
   x = 69,927.54