Finding the Fourth Proportional to 78.03, 107.53 and 53.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78.03 : 107.53 = 53.42 : x
2. Step 2: Convert to fraction form
   78.03/107.53 = 53.42/x
3. Step 3: Cross multiply
   78.03x = 107.53 × 53.42
4. Step 4: Simplify right side
   78.03x = 5,744.34
5. Step 5: Solve for x
   x = 5,744.34/78.03
6. Step 6: Final answer
   x = 73.62