Finding the Fourth Proportional to 81,238.10, 121,808.55 and 41,872.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,238.10 : 121,808.55 = 41,872.10 : x
2. Step 2: Convert to fraction form
   81,238.10/121,808.55 = 41,872.10/x
3. Step 3: Cross multiply
   81,238.10x = 121,808.55 × 41,872.10
4. Step 4: Simplify right side
   81,238.10x = 5,100,379,786.46
5. Step 5: Solve for x
   x = 5,100,379,786.46/81,238.10
6. Step 6: Final answer
   x = 62,783.10