Finding the Fourth Proportional to 71.91, 99.24 and 42.81

Step by Step Solution

1. Step 1: Write the proportion equation
   71.91 : 99.24 = 42.81 : x
2. Step 2: Convert to fraction form
   71.91/99.24 = 42.81/x
3. Step 3: Cross multiply
   71.91x = 99.24 × 42.81
4. Step 4: Simplify right side
   71.91x = 4,248.46
5. Step 5: Solve for x
   x = 4,248.46/71.91
6. Step 6: Final answer
   x = 59.08