Finding the Fourth Proportional to 72.18, 108.20 and 46.53

Step by Step Solution

1. Step 1: Write the proportion equation
   72.18 : 108.20 = 46.53 : x
2. Step 2: Convert to fraction form
   72.18/108.20 = 46.53/x
3. Step 3: Cross multiply
   72.18x = 108.20 × 46.53
4. Step 4: Simplify right side
   72.18x = 5,034.31
5. Step 5: Solve for x
   x = 5,034.31/72.18
6. Step 6: Final answer
   x = 69.75