Finding the Fourth Proportional to 72.12, 108.10 and 51.83

Step by Step Solution

1. Step 1: Write the proportion equation
   72.12 : 108.10 = 51.83 : x
2. Step 2: Convert to fraction form
   72.12/108.10 = 51.83/x
3. Step 3: Cross multiply
   72.12x = 108.10 × 51.83
4. Step 4: Simplify right side
   72.12x = 5,602.82
5. Step 5: Solve for x
   x = 5,602.82/72.12
6. Step 6: Final answer
   x = 77.69