Finding the Fourth Proportional to 42.59, 58.83 and 31.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42.59 : 58.83 = 31.55 : x
2. Step 2: Convert to fraction form
   42.59/58.83 = 31.55/x
3. Step 3: Cross multiply
   42.59x = 58.83 × 31.55
4. Step 4: Simplify right side
   42.59x = 1,855.83
5. Step 5: Solve for x
   x = 1,855.83/42.59
6. Step 6: Final answer
   x = 43.58