Finding the Fourth Proportional to 78.18, 117.18 and 32.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78.18 : 117.18 = 32.50 : x
2. Step 2: Convert to fraction form
   78.18/117.18 = 32.50/x
3. Step 3: Cross multiply
   78.18x = 117.18 × 32.50
4. Step 4: Simplify right side
   78.18x = 3,808.14
5. Step 5: Solve for x
   x = 3,808.14/78.18
6. Step 6: Final answer
   x = 48.71