Finding the Fourth Proportional to 72.63, 100.17 and 56.03

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 100.17 = 56.03 : x
2. Step 2: Convert to fraction form
   72.63/100.17 = 56.03/x
3. Step 3: Cross multiply
   72.63x = 100.17 × 56.03
4. Step 4: Simplify right side
   72.63x = 5,612.02
5. Step 5: Solve for x
   x = 5,612.02/72.63
6. Step 6: Final answer
   x = 77.27