Finding the Fourth Proportional to 76.55, 105.60 and 51.98

Step by Step Solution

1. Step 1: Write the proportion equation
   76.55 : 105.60 = 51.98 : x
2. Step 2: Convert to fraction form
   76.55/105.60 = 51.98/x
3. Step 3: Cross multiply
   76.55x = 105.60 × 51.98
4. Step 4: Simplify right side
   76.55x = 5,488.75
5. Step 5: Solve for x
   x = 5,488.75/76.55
6. Step 6: Final answer
   x = 71.71