Finding the Fourth Proportional to 87.89, 131.72 and 42.19

Step by Step Solution

1. Step 1: Write the proportion equation
   87.89 : 131.72 = 42.19 : x
2. Step 2: Convert to fraction form
   87.89/131.72 = 42.19/x
3. Step 3: Cross multiply
   87.89x = 131.72 × 42.19
4. Step 4: Simplify right side
   87.89x = 5,556.73
5. Step 5: Solve for x
   x = 5,556.73/87.89
6. Step 6: Final answer
   x = 63.23