Finding the Fourth Proportional to 87.77, 131.69 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   87.77 : 131.69 = 42.10 : x
2. Step 2: Convert to fraction form
   87.77/131.69 = 42.10/x
3. Step 3: Cross multiply
   87.77x = 131.69 × 42.10
4. Step 4: Simplify right side
   87.77x = 5,543.28
5. Step 5: Solve for x
   x = 5,543.28/87.77
6. Step 6: Final answer
   x = 63.16