Finding the Fourth Proportional to 42.67, 58.94 and 31.00

Step by Step Solution

1. Step 1: Write the proportion equation
   42.67 : 58.94 = 31.00 : x
2. Step 2: Convert to fraction form
   42.67/58.94 = 31.00/x
3. Step 3: Cross multiply
   42.67x = 58.94 × 31.00
4. Step 4: Simplify right side
   42.67x = 1,827.15
5. Step 5: Solve for x
   x = 1,827.15/42.67
6. Step 6: Final answer
   x = 42.82