Finding the Fourth Proportional to 72.80, 109.01 and 51.08

Step by Step Solution

1. Step 1: Write the proportion equation
   72.80 : 109.01 = 51.08 : x
2. Step 2: Convert to fraction form
   72.80/109.01 = 51.08/x
3. Step 3: Cross multiply
   72.80x = 109.01 × 51.08
4. Step 4: Simplify right side
   72.80x = 5,567.43
5. Step 5: Solve for x
   x = 5,567.43/72.80
6. Step 6: Final answer
   x = 76.48