Finding the Fourth Proportional to 78.42, 108.24 and 45.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78.42 : 108.24 = 45.69 : x
2. Step 2: Convert to fraction form
   78.42/108.24 = 45.69/x
3. Step 3: Cross multiply
   78.42x = 108.24 × 45.69
4. Step 4: Simplify right side
   78.42x = 4,945.49
5. Step 5: Solve for x
   x = 4,945.49/78.42
6. Step 6: Final answer
   x = 63.06