Finding the Fourth Proportional to 78.60, 117.98 and 42.52

Step by Step Solution

1. Step 1: Write the proportion equation
   78.60 : 117.98 = 42.52 : x
2. Step 2: Convert to fraction form
   78.60/117.98 = 42.52/x
3. Step 3: Cross multiply
   78.60x = 117.98 × 42.52
4. Step 4: Simplify right side
   78.60x = 5,016.51
5. Step 5: Solve for x
   x = 5,016.51/78.60
6. Step 6: Final answer
   x = 63.82