Finding the Fourth Proportional to 42.18, 63.00 and 39.84

Step by Step Solution

1. Step 1: Write the proportion equation
   42.18 : 63.00 = 39.84 : x
2. Step 2: Convert to fraction form
   42.18/63.00 = 39.84/x
3. Step 3: Cross multiply
   42.18x = 63.00 × 39.84
4. Step 4: Simplify right side
   42.18x = 2,509.77
5. Step 5: Solve for x
   x = 2,509.77/42.18
6. Step 6: Final answer
   x = 59.50