Finding the Fourth Proportional to 284.18, 426.18 and 78.69

Step by Step Solution

1. Step 1: Write the proportion equation
   284.18 : 426.18 = 78.69 : x
2. Step 2: Convert to fraction form
   284.18/426.18 = 78.69/x
3. Step 3: Cross multiply
   284.18x = 426.18 × 78.69
4. Step 4: Simplify right side
   284.18x = 33,536.10
5. Step 5: Solve for x
   x = 33,536.10/284.18
6. Step 6: Final answer
   x = 118.01