Finding the Fourth Proportional to 75.50, 104.18 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   75.50 : 104.18 = 42.31 : x
2. Step 2: Convert to fraction form
   75.50/104.18 = 42.31/x
3. Step 3: Cross multiply
   75.50x = 104.18 × 42.31
4. Step 4: Simplify right side
   75.50x = 4,407.31
5. Step 5: Solve for x
   x = 4,407.31/75.50
6. Step 6: Final answer
   x = 58.38