Finding the Fourth Proportional to 78.37, 117.56 and 42.37

Step by Step Solution

1. Step 1: Write the proportion equation
   78.37 : 117.56 = 42.37 : x
2. Step 2: Convert to fraction form
   78.37/117.56 = 42.37/x
3. Step 3: Cross multiply
   78.37x = 117.56 × 42.37
4. Step 4: Simplify right side
   78.37x = 4,980.81
5. Step 5: Solve for x
   x = 4,980.81/78.37
6. Step 6: Final answer
   x = 63.56