Finding the Fourth Proportional to 78.09, 107.75 and 46.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78.09 : 107.75 = 46.98 : x
2. Step 2: Convert to fraction form
   78.09/107.75 = 46.98/x
3. Step 3: Cross multiply
   78.09x = 107.75 × 46.98
4. Step 4: Simplify right side
   78.09x = 5,061.86
5. Step 5: Solve for x
   x = 5,061.86/78.09
6. Step 6: Final answer
   x = 64.82