Finding the Fourth Proportional to 81,783.43, 122,674.73 and 21,811.78

Step by Step Solution

1. Step 1: Write the proportion equation
   81,783.43 : 122,674.73 = 21,811.78 : x
2. Step 2: Convert to fraction form
   81,783.43/122,674.73 = 21,811.78/x
3. Step 3: Cross multiply
   81,783.43x = 122,674.73 × 21,811.78
4. Step 4: Simplify right side
   81,783.43x = 2,675,753,499.89
5. Step 5: Solve for x
   x = 2,675,753,499.89/81,783.43
6. Step 6: Final answer
   x = 32,717.55