Finding the Fourth Proportional to 42.84, 58.86 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.84 : 58.86 = 42.18 : x
2. Step 2: Convert to fraction form
   42.84/58.86 = 42.18/x
3. Step 3: Cross multiply
   42.84x = 58.86 × 42.18
4. Step 4: Simplify right side
   42.84x = 2,482.71
5. Step 5: Solve for x
   x = 2,482.71/42.84
6. Step 6: Final answer
   x = 57.95