Finding the Fourth Proportional to 78.38, 108.15 and 46.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78.38 : 108.15 = 46.88 : x
2. Step 2: Convert to fraction form
   78.38/108.15 = 46.88/x
3. Step 3: Cross multiply
   78.38x = 108.15 × 46.88
4. Step 4: Simplify right side
   78.38x = 5,070.02
5. Step 5: Solve for x
   x = 5,070.02/78.38
6. Step 6: Final answer
   x = 64.68