Finding the Fourth Proportional to 42.43, 58.58 and 31.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42.43 : 58.58 = 31.37 : x
2. Step 2: Convert to fraction form
   42.43/58.58 = 31.37/x
3. Step 3: Cross multiply
   42.43x = 58.58 × 31.37
4. Step 4: Simplify right side
   42.43x = 1,837.72
5. Step 5: Solve for x
   x = 1,837.72/42.43
6. Step 6: Final answer
   x = 43.31