Finding the Fourth Proportional to 73.02, 100.78 and 54.57

Step by Step Solution

1. Step 1: Write the proportion equation
   73.02 : 100.78 = 54.57 : x
2. Step 2: Convert to fraction form
   73.02/100.78 = 54.57/x
3. Step 3: Cross multiply
   73.02x = 100.78 × 54.57
4. Step 4: Simplify right side
   73.02x = 5,499.43
5. Step 5: Solve for x
   x = 5,499.43/73.02
6. Step 6: Final answer
   x = 75.31