Finding the Fourth Proportional to 21,181.98, 31,771.59 and 8,698.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,181.98 : 31,771.59 = 8,698.77 : x
2. Step 2: Convert to fraction form
   21,181.98/31,771.59 = 8,698.77/x
3. Step 3: Cross multiply
   21,181.98x = 31,771.59 × 8,698.77
4. Step 4: Simplify right side
   21,181.98x = 276,373,753.94
5. Step 5: Solve for x
   x = 276,373,753.94/21,181.98
6. Step 6: Final answer
   x = 13,047.59