Finding the Fourth Proportional to 42.98, 59.30 and 30.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42.98 : 59.30 = 30.70 : x
2. Step 2: Convert to fraction form
   42.98/59.30 = 30.70/x
3. Step 3: Cross multiply
   42.98x = 59.30 × 30.70
4. Step 4: Simplify right side
   42.98x = 1,820.51
5. Step 5: Solve for x
   x = 1,820.51/42.98
6. Step 6: Final answer
   x = 42.36