Finding the Fourth Proportional to 72.74, 100.28 and 58.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.74 : 100.28 = 58.02 : x
2. Step 2: Convert to fraction form
   72.74/100.28 = 58.02/x
3. Step 3: Cross multiply
   72.74x = 100.28 × 58.02
4. Step 4: Simplify right side
   72.74x = 5,817.96
5. Step 5: Solve for x
   x = 5,817.96/72.74
6. Step 6: Final answer
   x = 79.99