Finding the Fourth Proportional to 52.58, 78.56 and 42.83

Step by Step Solution

1. Step 1: Write the proportion equation
   52.58 : 78.56 = 42.83 : x
2. Step 2: Convert to fraction form
   52.58/78.56 = 42.83/x
3. Step 3: Cross multiply
   52.58x = 78.56 × 42.83
4. Step 4: Simplify right side
   52.58x = 3,364.33
5. Step 5: Solve for x
   x = 3,364.33/52.58
6. Step 6: Final answer
   x = 63.99