Finding the Fourth Proportional to 72.40, 108.52 and 46.64

Step by Step Solution

1. Step 1: Write the proportion equation
   72.40 : 108.52 = 46.64 : x
2. Step 2: Convert to fraction form
   72.40/108.52 = 46.64/x
3. Step 3: Cross multiply
   72.40x = 108.52 × 46.64
4. Step 4: Simplify right side
   72.40x = 5,061.37
5. Step 5: Solve for x
   x = 5,061.37/72.40
6. Step 6: Final answer
   x = 69.91