Finding the Fourth Proportional to 72.34, 108.30 and 51.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.34 : 108.30 = 51.98 : x
2. Step 2: Convert to fraction form
   72.34/108.30 = 51.98/x
3. Step 3: Cross multiply
   72.34x = 108.30 × 51.98
4. Step 4: Simplify right side
   72.34x = 5,629.43
5. Step 5: Solve for x
   x = 5,629.43/72.34
6. Step 6: Final answer
   x = 77.82