Finding the Fourth Proportional to 56.10, 83.85 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   56.10 : 83.85 = 42.42 : x
2. Step 2: Convert to fraction form
   56.10/83.85 = 42.42/x
3. Step 3: Cross multiply
   56.10x = 83.85 × 42.42
4. Step 4: Simplify right side
   56.10x = 3,556.92
5. Step 5: Solve for x
   x = 3,556.92/56.10
6. Step 6: Final answer
   x = 63.40