Finding the Fourth Proportional to 42.97, 59.31 and 30.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42.97 : 59.31 = 30.70 : x
2. Step 2: Convert to fraction form
   42.97/59.31 = 30.70/x
3. Step 3: Cross multiply
   42.97x = 59.31 × 30.70
4. Step 4: Simplify right side
   42.97x = 1,820.82
5. Step 5: Solve for x
   x = 1,820.82/42.97
6. Step 6: Final answer
   x = 42.37