Finding the Fourth Proportional to 71.97, 99.33 and 42.87

Step by Step Solution

1. Step 1: Write the proportion equation
   71.97 : 99.33 = 42.87 : x
2. Step 2: Convert to fraction form
   71.97/99.33 = 42.87/x
3. Step 3: Cross multiply
   71.97x = 99.33 × 42.87
4. Step 4: Simplify right side
   71.97x = 4,258.28
5. Step 5: Solve for x
   x = 4,258.28/71.97
6. Step 6: Final answer
   x = 59.17