Finding the Fourth Proportional to 42.50, 58.56 and 31.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42.50 : 58.56 = 31.56 : x
2. Step 2: Convert to fraction form
   42.50/58.56 = 31.56/x
3. Step 3: Cross multiply
   42.50x = 58.56 × 31.56
4. Step 4: Simplify right side
   42.50x = 1,848.15
5. Step 5: Solve for x
   x = 1,848.15/42.50
6. Step 6: Final answer
   x = 43.49