Finding the Fourth Proportional to 72.62, 100.15 and 56.01

Step by Step Solution

1. Step 1: Write the proportion equation
   72.62 : 100.15 = 56.01 : x
2. Step 2: Convert to fraction form
   72.62/100.15 = 56.01/x
3. Step 3: Cross multiply
   72.62x = 100.15 × 56.01
4. Step 4: Simplify right side
   72.62x = 5,609.40
5. Step 5: Solve for x
   x = 5,609.40/72.62
6. Step 6: Final answer
   x = 77.24