Finding the Fourth Proportional to 72.98, 109.35 and 51.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.98 : 109.35 = 51.50 : x
2. Step 2: Convert to fraction form
   72.98/109.35 = 51.50/x
3. Step 3: Cross multiply
   72.98x = 109.35 × 51.50
4. Step 4: Simplify right side
   72.98x = 5,631.53
5. Step 5: Solve for x
   x = 5,631.53/72.98
6. Step 6: Final answer
   x = 77.17