Finding the Fourth Proportional to 72.99, 100.62 and 53.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 100.62 = 53.55 : x
2. Step 2: Convert to fraction form
   72.99/100.62 = 53.55/x
3. Step 3: Cross multiply
   72.99x = 100.62 × 53.55
4. Step 4: Simplify right side
   72.99x = 5,388.20
5. Step 5: Solve for x
   x = 5,388.20/72.99
6. Step 6: Final answer
   x = 73.82