Finding the Fourth Proportional to 72.62, 109.00 and 53.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.62 : 109.00 = 53.12 : x
2. Step 2: Convert to fraction form
   72.62/109.00 = 53.12/x
3. Step 3: Cross multiply
   72.62x = 109.00 × 53.12
4. Step 4: Simplify right side
   72.62x = 5,789.60
5. Step 5: Solve for x
   x = 5,789.60/72.62
6. Step 6: Final answer
   x = 79.72