Finding the Fourth Proportional to 51.98, 71.64 and 42.74

Step by Step Solution

1. Step 1: Write the proportion equation
   51.98 : 71.64 = 42.74 : x
2. Step 2: Convert to fraction form
   51.98/71.64 = 42.74/x
3. Step 3: Cross multiply
   51.98x = 71.64 × 42.74
4. Step 4: Simplify right side
   51.98x = 3,061.89
5. Step 5: Solve for x
   x = 3,061.89/51.98
6. Step 6: Final answer
   x = 58.91