Finding the Fourth Proportional to 78.63, 108.49 and 50.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78.63 : 108.49 = 50.61 : x
2. Step 2: Convert to fraction form
   78.63/108.49 = 50.61/x
3. Step 3: Cross multiply
   78.63x = 108.49 × 50.61
4. Step 4: Simplify right side
   78.63x = 5,490.55
5. Step 5: Solve for x
   x = 5,490.55/78.63
6. Step 6: Final answer
   x = 69.83