Finding the Fourth Proportional to 72.42, 100.02 and 57.84

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 100.02 = 57.84 : x
2. Step 2: Convert to fraction form
   72.42/100.02 = 57.84/x
3. Step 3: Cross multiply
   72.42x = 100.02 × 57.84
4. Step 4: Simplify right side
   72.42x = 5,785.16
5. Step 5: Solve for x
   x = 5,785.16/72.42
6. Step 6: Final answer
   x = 79.88