Finding the Fourth Proportional to 78.50, 117.72 and 32.85

Step by Step Solution

1. Step 1: Write the proportion equation
   78.50 : 117.72 = 32.85 : x
2. Step 2: Convert to fraction form
   78.50/117.72 = 32.85/x
3. Step 3: Cross multiply
   78.50x = 117.72 × 32.85
4. Step 4: Simplify right side
   78.50x = 3,867.10
5. Step 5: Solve for x
   x = 3,867.10/78.50
6. Step 6: Final answer
   x = 49.26