Finding the Fourth Proportional to 68.30, 102.50 and 50.31

Step by Step Solution

1. Step 1: Write the proportion equation
   68.30 : 102.50 = 50.31 : x
2. Step 2: Convert to fraction form
   68.30/102.50 = 50.31/x
3. Step 3: Cross multiply
   68.30x = 102.50 × 50.31
4. Step 4: Simplify right side
   68.30x = 5,156.27
5. Step 5: Solve for x
   x = 5,156.27/68.30
6. Step 6: Final answer
   x = 75.49