Finding the Fourth Proportional to 87.69, 131.47 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   87.69 : 131.47 = 42.06 : x
2. Step 2: Convert to fraction form
   87.69/131.47 = 42.06/x
3. Step 3: Cross multiply
   87.69x = 131.47 × 42.06
4. Step 4: Simplify right side
   87.69x = 5,529.52
5. Step 5: Solve for x
   x = 5,529.52/87.69
6. Step 6: Final answer
   x = 63.06