Finding the Fourth Proportional to 43.50, 59.58 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   43.50 : 59.58 = 42.15 : x
2. Step 2: Convert to fraction form
   43.50/59.58 = 42.15/x
3. Step 3: Cross multiply
   43.50x = 59.58 × 42.15
4. Step 4: Simplify right side
   43.50x = 2,511.30
5. Step 5: Solve for x
   x = 2,511.30/43.50
6. Step 6: Final answer
   x = 57.73