Finding the Fourth Proportional to 56.99, 78.61 and 42.41

Step by Step Solution

1. Step 1: Write the proportion equation
   56.99 : 78.61 = 42.41 : x
2. Step 2: Convert to fraction form
   56.99/78.61 = 42.41/x
3. Step 3: Cross multiply
   56.99x = 78.61 × 42.41
4. Step 4: Simplify right side
   56.99x = 3,333.85
5. Step 5: Solve for x
   x = 3,333.85/56.99
6. Step 6: Final answer
   x = 58.50