Finding the Fourth Proportional to 78.62, 117.86 and 42.52

Step by Step Solution

1. Step 1: Write the proportion equation
   78.62 : 117.86 = 42.52 : x
2. Step 2: Convert to fraction form
   78.62/117.86 = 42.52/x
3. Step 3: Cross multiply
   78.62x = 117.86 × 42.52
4. Step 4: Simplify right side
   78.62x = 5,011.41
5. Step 5: Solve for x
   x = 5,011.41/78.62
6. Step 6: Final answer
   x = 63.74