Finding the Fourth Proportional to 72.94, 100.80 and 53.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72.94 : 100.80 = 53.76 : x
2. Step 2: Convert to fraction form
   72.94/100.80 = 53.76/x
3. Step 3: Cross multiply
   72.94x = 100.80 × 53.76
4. Step 4: Simplify right side
   72.94x = 5,419.01
5. Step 5: Solve for x
   x = 5,419.01/72.94
6. Step 6: Final answer
   x = 74.29