Finding the Fourth Proportional to 72.63, 100.28 and 56.34

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 100.28 = 56.34 : x
2. Step 2: Convert to fraction form
   72.63/100.28 = 56.34/x
3. Step 3: Cross multiply
   72.63x = 100.28 × 56.34
4. Step 4: Simplify right side
   72.63x = 5,649.49
5. Step 5: Solve for x
   x = 5,649.49/72.63
6. Step 6: Final answer
   x = 77.78