Finding the Fourth Proportional to 51.91, 71.72 and 42.69

Step by Step Solution

1. Step 1: Write the proportion equation
   51.91 : 71.72 = 42.69 : x
2. Step 2: Convert to fraction form
   51.91/71.72 = 42.69/x
3. Step 3: Cross multiply
   51.91x = 71.72 × 42.69
4. Step 4: Simplify right side
   51.91x = 3,061.83
5. Step 5: Solve for x
   x = 3,061.83/51.91
6. Step 6: Final answer
   x = 58.99