Finding the Fourth Proportional to 72.81, 100.58 and 53.51

Step by Step Solution

1. Step 1: Write the proportion equation
   72.81 : 100.58 = 53.51 : x
2. Step 2: Convert to fraction form
   72.81/100.58 = 53.51/x
3. Step 3: Cross multiply
   72.81x = 100.58 × 53.51
4. Step 4: Simplify right side
   72.81x = 5,381.27
5. Step 5: Solve for x
   x = 5,381.27/72.81
6. Step 6: Final answer
   x = 73.91