Finding the Fourth Proportional to 42.10, 56.84 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42.10 : 56.84 = 42.10 : x
2. Step 2: Convert to fraction form
   42.10/56.84 = 42.10/x
3. Step 3: Cross multiply
   42.10x = 56.84 × 42.10
4. Step 4: Simplify right side
   42.10x = 2,392.75
5. Step 5: Solve for x
   x = 2,392.75/42.10
6. Step 6: Final answer
   x = 56.84